if you go the route you're intending: install windows, then install ubuntu. (the XP installation will most definitely f\/ck up the bootloader if you install it after linux.)
on the windows front, i advise you give this a try: install windows, get all vital applications and patches done. then roll a ghost image (or use whatever imaging tool strikes your fancy). anytime you'd like to go back to this mostly pristine state, it's there for you.
i went so far with my most recent reinstallation to download all patches to a removable drive, formatted the OS drive, reinstalled windows and got everything set exactly 'just so' with my OS without it ever even touching the internet. that image is definitely a 'keeper' !
on the ubuntu front, i got all my keymappings set in Audacity so that it resembled soundforge as much as possible, yet i still couldn't get completely comfortable. so like you, i'm still in XP-land for soundforge. if anyone can cough up advice on breaking the soundforge habit, please share!
EDIT to add: one last thought on the linux front. i know the WINE project just hit the exalted version 1.0 milestone after so many years, so that might be the way we get to have our cake and eat it. not sure how soundforge behaves under WINE, but i'm going to be experimenting with that later today.