Altough I dont believe these statements for one bit, sepparating the PC from the audio part is a good idea. I get high pitched noises from my speakers if the computer is too close. And its in a steel rackmount case, you'd think that would keep interference from leaking out but it still does.
OT, You don't need to spend stupid amounts of money on these things. Standard isolation transformers and double conversion UPS will do the job even better and save you money.