Looking for some input and what may be the better upgrade option currently (for gaming).  Coming up on the 4 year mark on my current build and usually thats when I sit down and build a new one.  1999, 2003, 2007....2011.  But at the 4 year mark I really haven't had too much in performance concerns for me to warrant a new build.  At least for what I'm playing.
Currently:
Win7 64bit
C2D E6400 Allendale @ 2.8ghz
4gb ddr2 800
Geforce 8800 GTS 640mb
I'm looking at $100-$130 range on this temporary upgrade, but I'm kind of stuck on the two upgrades I want.  On my current motherboard I can go the E8xxx Wolfdale route on CPUs, but they're quite pricey.  But I can also use the other E6xxx Wolfdales as well and overclock.
E6700 Wolfdate (stock 3.2ghz, would probably take it to 3.8ghz) is $95
or
Geforce GTS 450 is $130
Haven't touch AH in a while, but she did a pretty good job on the new graphics updates the last time I check (could be a bit better).  But pretty much play L4D2 which at med/high at 1680x1050 is a low of 45 FPS.  Eve, really doesnt tax my system at all.  Mafia 2 ran all right.