definatly try the free trial, here's what i did:
bought a second hard drive(needed more storage down that road anyways) and set up winxp32 on my 80gig hard drive, ill run anything on that that wont work for winxp64(note i havent booted it up more then once since i did all this), then on my new 120gig hard drive i installed the trial for winxp64 and have been using it to my hearts delight, all 32bit software i use works fine such as a plethora of games, photshop cs2, dreamweaver and flash(mx 2004), firefox(who cares about IE64 lol), any several other things to come!
and anything that takes advantage of the 64bit side of things runs great, patched far cry, IE64(har har), etc...
this was my first time installed a second hard drive and it was simple, no problems there...and get a small hard drive if your just getting the drive for this test and try it out!!