I've had mine awhile, but I have concerns.

I'm 32 bit, XP, Sonar 8.3 Pro, and I have a buttload of VSTs, instruments, FX, etc...

I'm concerned with the whole 32/64 bridge thing.

I'm concerned with leaving Sonar and going X2.

I'm very happy with my present system other than I can max the Quadcore on a big project. So I'm wondering/thinking about a nice bigger faster machine, maybe ruining Windoze 7 (in a 32 bit config?) and just installing my 8.3 Pro and migrating everything over to it. Can anyone tell me why this is a bad idea? 

There's very little point in running a 32 bit OS these days.

The reason your Quadcore is crapping out is probably more a RAM issue where you're limited to 4Gb max, more like 3.25Gb, on any 32 bit OS

So do like a lot of others have done & bite the bullet.

I had collected many vst's that haven't been ported to 64 bit, and the vast majority of them work under 64 bit Sonar in Bridged mode. The few that don't I've learned to live without.

How many compressors do you need anyway????

Are you happy with the music that you're making?

I know people who are happily making great records with 1960's-era equipment. To them, the quandary over migrating from 32- to 64-bits is a laughable non-issue.

I do, however, agree with Jonesey (I can count on one hand the number of times I haven't agreed with Jonesey) that the migration needn't be traumatic. Install both versions on your new machine and continue to use the 32-bit version for projects that need it. Use the 64-bit version for sample-heavy projects that need the extra RAM.

Whether or not to upgrade to X2 is a separate issue. I have no intention of moving from SONAR 8.5, which is better suited to my way of working and does not constrain me in any significant way. X2, OTOH, would impose new constraints due to the way automation has been implemented.

Everything that bit said is what I think and do.
Check that all drivers are available for your hardware and win7-64.

It was 99% painless for me too. All I got was a few warnings that some plug ins might sound different. And a couple of old freebee's from KVS showed as greyed out. So you could see what they originally were at least. All easily replaced. All the Sonar plugs work the same as before. 

There was a huge improvement in overall performance for me. The new CPU was not much faster than the old one, But having more RAM and the 64 bit thing made working with VST's like Session drummer run without issues. 32 Bit never worked for me,,, ever. 

Do it...

I'm running on a 32 bit W7pro system..... and really have no plans to move to 64 bit any time soon. 

I mostly work projects with around 12 to 24 tracks and mostly audio. What isn't audio is bounced to audio before project's end. (usually) 

I know that most every company is making 64 bit VST's and soon, there will not be 32 bit new toys available for most things.    I will have to deal with that. 

My philosophy is simple. As long as I can do what I need to do on this machine, and the machine keeps running and is repairable when it breaks down..... I will continue to use this platform. 

I intentionally ordered and bought a "new old" version of the W7pro 32 bit operating system so I would have it to install since by the time I was building this DAW, the 64bit version was the only one in the stores. 

I know that one day I will be face to face with a brick wall and I'll bite the bullet on that day..... until then, I'll rock 32 bits all day long.

Took a call from support today on my DAW (it died 3 days ago) they said the C drive is not a happy camper... I asked if they could recover? Because if they can't I have to reinstall all of my SW (lots) I have my projects saved on a USB drive, so they should be OK. I'm just hoping they can get a new C drive in there and salvage all of my licences, etc. Should know by tomorrow if I'll be recording next week, or installing SW :-( People who don't do this "have no idea."

Got it back today good as new :-) so I guess I need to start making plans now, so it's not a catastrophe when she finally gives up the ghost drive...

I traded in old projects and old vsts that I once thought were awesome for windows 7 and 64 bit.
i always keep up on the os as soon as it comes out.
the switch though from 32X win XP was the biggest jump by far.
but like i said, the trade off was well worth it.
windows 7 is smooth, win 8 even smoother (im not concerned about a start menu)

I only keep a 100 Gig partition for my C drive and put only the bare bones stuff on it. If it dies it's only a few hours work for me.

What I have done is only install the OS, then Sonar and Wave Lab. Then latter if I need a program I'll install it then. You'd be surprised what you don't need. All my software and VSt's  are on the Data drive ready to install when needed.