For neatness mainly, I have been looking at all in one PCs and also the iMac. For years I have been running Sonar X2 Producer, and it does all I need. 
 
Last time I looked at this, I think Bootcamp was the only option for running Windows on a Mac. I went to the Apple Store today and they told me that Parallels is the way to go. 
 
Is anyone running Sonar Producer on an iMac using Parallels? Any issues at all? 
 
Thanks all. 
 
Bill
 
 

 
Bootcamp is definitely the way to go if you want to run Sonar on a Mac as parallels shares drivers and system resources with OSX.
Also, unless you are running a fairly generic soundcard, you will probably have trouble getting your audio interface (and asio drivers) to run under paralells.
 
And they call them Apple store geniuses??

Should also add I'm running a Focusrite Pro 14, via Firewire. 

I've had no experience with Parallels, but I can say that Sonar runs like a champ under Bootcamp. I've been running such for a couple of years now on my second MacPro used only for Sonar/Bootcamp
 

OK, let's rephrase the question - sounds like Bootcamp is the way to go. I guess an iMac would be be more than powerful enough? 

3.3GHz quad-core Intel Core i5 processor

Turbo Boost up to 3.9GHz

8GB (two 4GB) memory, configurable up to 32GB

2TB Fusion Drive¹

AMD Radeon R9 M395 with 2GB video memory

Retina 5K 5120x2880 P3 display 
And the connectivity would work too for my Focusrite? I think there is an adapter for firewire to thunderbolt.

Can't  say for sure that the firewire/thunderbolt adapter will work, but it should be fine (I have had only one device not play nicely, and it may or may not have been the adapter).
 
FWIW last year I replaced an iMac with a HP all in one PC that was twice the specs for about half the price, and it has a touchscreen. Worth checking out unless of course you have particular appleware you wish to run.

tenfoot
 
FWIW last year I replaced an iMac with a HP all in one PC that was twice the specs for about half the price, and it has a touchscreen. Worth checking out unless of course you have particular appleware you wish to run.

I would almost prefer that being a Sonar user...checking out the usual suppliers of audio PCs in the UK, they don't seem to advertise all in ones. Again, if anyone has a lead on this it would be great. 

I recommend against all-in-ones since they use proprietary hardware and thus are difficult to repair or upgrade, and often cost more. Also monitors tend to outlive computers quite a bit and with an AIO you are tying a monitor to computer hardware so you can have to toss a perfectly good monitor just because the computer has gotten too old to be usable.
 
However, if you wish to have a Windows AIO then Dell is probably the way to go. An Optiplex 7440 would be a good choice, or an XPS 27 touch.

I have tried this with X1, just to see how far I could take it on a MacBook Pro. It was pretty disappointing, but pretty much what I expected.

The thing with Parallels, VMWare, VirtualBox, etc. running a VM (Virtual Machine) of Windows is that they are emulators, not machines. Your Mac has to carve out a bit of its own data busses, RAM, CPU, etc. to not only run the VM, but maintain its own state. And the Mac's state typically takes priority. When your machine needs to run some rudimentary task, it may rob your VM of valuable resources, even if for only a few seconds.

Audio/video productions are not tolerant to interruptions from the host (the Mac), and unless you're running a fast Mac Pro, your Mac isn't all that good at running VMs in Parallels or other VM's. Apple does a great job crippling their own hardware to provide longevity and reliability, meanwhile saving some battery power, as in the case of laptops. They also are prone to heat issues, with the smaller footprints of the MacMinis and iMac hardware, sothey have to cripple the hardware to keep heat down.
 
More, Windows is probably the heaviest OS around. Sonar is demanding, modeled and large plug-ins are demanding, and Parallels is heavy. You need a really beefy Mac running Sonar in Parallels to keep up with a Windows machine costing 1/3 of the Mac price to do the same job or better.
 
My experience wasn't addressing driver issues, but rather bad audio and slowness of Sonar. Editing was a nightmare.

Sycraft
I recommend against all-in-ones since they use proprietary hardware and thus are difficult to repair or upgrade, and often cost more. Also monitors tend to outlive computers quite a bit and with an AIO you are tying a monitor to computer hardware so you can have to toss a perfectly good monitor just because the computer has gotten too old to be usable.
 
However, if you wish to have a Windows AIO then Dell is probably the way to go. An Optiplex 7440 would be a good choice, or an XPS 27 touch.

I agree with this as well. Get a basic machine from Directron.com or someplace like that, buy the basic machine but leave open options to expand, change, etc. I bought a box with extra slots for video card/audio card upgrade potential as time moved on. Never know when you might need four 30" screens and 3 or 4 sound-cards down the road as they become cheaper, but Sonar grows bigger.