not completely true.
when i build a new setup, i get close to the best available. it's stupid buying mediocre stuff now to save $100, because you're going to be in the same position in 2 years.
the build i did before this was an all out build, and that was 4 or 5 years ago. just this year it was having problems keeping up.
I don't buy into that pro-advertising hype. All my systems are based off the best available for a few years prior. If you only knew the extent that I push my system with audio, no hiccups whatsoever. It's actually more than I need, but that's OK. I run 50 simultanious wave files, that are about 100 meg each. Each file is loaded with 1-5 real-time effect plug ins, and 2-5 CPU intensive soft synths. I even tested it with OC, and I didn't need it so I backed it off to keep temps low (although I run a great cooler anyway).
In 3-4 years when I need more power for some UAD cards I'll upgrade to an I7 when it makes sense, and the prices come down. Right now with an I7 there are too many things you have to change to make it work that are newer technology, so you will pay premium for just about everything.
At least the AMD's are all backward compatible. You can drop any of the newer ones in older boards down to the Athlon XP's. Socket A and up can all use the AM2, 2+, and socket 3 chips. So if you have a MoBo with AGP and socket A you can use the AM3 chips, you just can't take advantage of the faster ram speeds and a few new bios tweaks available. AMD has really improved their chipsets in the past few years, so any of the newer ones are good units.