I built my computer to be a mid-level HL2 box for the first release in 2004 and it did alright. I just managed to lower a few settings such that the latest releases won't crash, and Portal is currently rocking my face.
Ill never get anything as long as steam backs it :P kiss my arse steam !!! sorry.. never liked any of the games made with source that were FPS.
That's a fun way to close yourself off from all the non-Source content delivery offered by Steam!