A couple of things I found out about SSDs recently that may be useful:
 
Samsung 840 Evo SSDs need a firmware update to prevent them slowing down over time. To do this, download Samsung Magician from here: http://www.samsung.com/semiconductor/minisite/ssd/download/overview.html
 
Samsung Magician is also good for benchmarking SSDs of any brand, not just Samsung.
 
I discovered I wasn't running my SSDs in AHCI mode. It's a little tricky to make the change (it's a BIOS change but you have to prep the OS first). Changing to AHCI mode more than doubled my read/write speeds. Very cool!
 
Cheers, Peter.

kitekrazy1
Most migration software is made my Acronis.  I have True Image and when trying to use migration software it tells me to uninstall your previous version of Acronis.
 
I'm waiting for those 1TB SSD to really drop in price for VSTs that stream samples.

 
Exactly. I originally thought that I'd only configure a computer with an SSD system drive, but the way prices are coming down, it probably makes sense to do at least the samples drives (and maybe the project drive as well) as 1 TB SSD's as well. 

PeterMc
A couple of things I found out about SSDs recently that may be useful:
 
Samsung 840 Evo SSDs need a firmware update to prevent them slowing down over time. To do this, download Samsung Magician from here: http://www.samsung.com/semiconductor/minisite/ssd/download/overview.html
 
Samsung Magician is also good for benchmarking SSDs of any brand, not just Samsung.
 
I discovered I wasn't running my SSDs in AHCI mode. It's a little tricky to make the change (it's a BIOS change but you have to prep the OS first). Changing to AHCI mode more than doubled my read/write speeds. Very cool!
 
Cheers, Peter.

Thanks, Peter: these are good things to bear in mind. ADK will probably build my  next system; they've built three systems so far for me and I've really enjoyed their work. I'm sure that they're up on this, but still, it's good to know these things.

I use spinners for archival storage only. I find it really frustrating to use a system that's still running on spinners because it seems so slow after a couple years of working with SSD's.

No question SSD is the way to go.  Here's another trick that will solve a lot of performance problems:  each time you start Sonar, go to Task Manager and set 'Priority' to 'High' (not real time... trust me).  That solved a bunch of annoying problems for me.
 

A little testimonial here:
I recently installed Paragon Software's Hard Disk Manager for Mac. I needed it help manage my Bootcamp partition, and the migration back and forth between a hybrid drive (SSHD) and a solid state SSD. 
 
This product is a godsend. It supports resizing of partitions, full disk imaging, backup of Mac and Windows as virtual disk images, changing of GPT, MBR hybrid GPT+MBR's, and a bunch of other stuff. Although I have migrated disks using the Acronis license/tools that came with the Crucial BX100 SSD drives, the Paragon Software suites have been better in almost every way.   I also have the Paragon NTFS for Mac, and HFS+ for Windows.  There's also a Windows version of the product called Hard Disk Manager 15. 
 
If you're interested in more of my disk-related madness, you can read about my external Fusion Drive on my website.
http://www.tedlandstudio.com/#!new-wine-in-old-wineskins/m9z01
 
As you might imagine, I'm very much looking forward to SONAR Platinum on Mac. 

 
The drive was Samsung SSD 850 EVO,  500GB
 
The cloning s/w is Samsung Data Migration (application publisher is Clonix) and the drive comes with Samsung's Magician management app. 
 
jdf

I recently went SSD only. 
 
It's... fast.

I have an ssd system drive.
 
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzip!

https://www.amazon.com/Samsung-850-EVO-2-5-Inch-MZ-75E250B/dp/B00OAJ412U/ref=sr_1_1/156-1017405-1549308?ie=UTF8&qid=1471737026&sr=8-1&keywords=Samsung+850+EVO
 
I helped a friend build a new PC workstation last year, and suggested he try one of these new SSD drives.  After we booted his new system up, and saw the reboot take seconds, I went straight home and ordered one!
 
I migrated my C: drive to one of these bad boys ... wow!!!  Face melting speed :-)
 
This is definitely the best upgrade you can make to your PC.  The CPU & memory bottlenecks were solved years ago when the multi-core CPU's and fast DDR3 RAM became the standard.  The limiting factor once SATA drive interfaces were introduced with 3 GB/S or 6 GB/S ports was the spinning platter disks.  The SSD drive can now match the best throughput capabilities of your motherboard.
 
I used the Samsung migration tool and had no issues with Windows or any other software authentication afterwards.
 
Choosing what to install on the SSD is an individual choice based on how you will use the system.  I have Windows, Sonar, VST's, etc. on my boot drive, with all Cakewalk content such as multisamples, loops, etc., on my 7200rpm audio drive.
 
FYI: if you are upgrading a desktop, you can use a spare SATA port, or temporarily unplug another SATA HDD to make the migration. Then make the swap.  For laptops, there are kits that let you adapt the new SSD temporarily as USB until you finish the migration. Then you just swap it in.

If you have a modern motherboard with an M.2 interface you can use the newer SSD's.
 
The Samsung 950 PRO is M.2 and runs at 2,500 Mb/s.
The Samsung 850 EVO isn't and runs at 550 Mb/s for comparison. 
 
My motherboard is an early M.2 one, so it will run the 950 but not at full speed. I think it will 'only' manage 1,000 Mb/s ish. Best get saving up!