Going forward, as new multi-threaded game engines are coming on line, an 8 full-time core Bulldozer "should" best a 4 core CPU with hyperthreading. Also, Bulldozer "rebalances" between floating point performance and integer performance in its architecture. This should help in "older" games that ran better on Intel. So, on paper, it has many things going for it. We won't know until we have them on the market. Bulldozer prices are rumored to be relatively low. Looking like early Summer for Bulldozer -- but, who knows?
The HD69xx series is AMD's "new" architecture (the HD68xx is a tweaked older architecture). The HD69xx prices have come down so much that I'm surprised at the value. However, both AMD and Nvidia still use 40nm process. Next Fall (?) the 28nm node arrives (it is rumored) and GPU transistor density may nearly double -- with associated improvements in speed for both AMD and Nvidia. Think of the HD69xx and GTX580 as "placeholders" or "stopgaps" while we await 28nm.
For $2500, you will be able to buy more than you need this Fall (if the rumors are true). I'll be looking to upgrade completely -- but, my goal is approximately $1000 for the computer itself (excluding keyboard, monitors, etc). We'll see

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ATI Sapphire HD7970 OC - Eyefinity 5760x1200 24", 1xDell-U2410 H-IPS + 2xHP-ZR24w S-IPS, Extended 23" Samsung cPVA, Ceton InfiniTV 4, Bulldozer FX8150@4.5GHz w/Swiftech Water Cooling, 16GB GSKILL PC3 @1866, ASUS Sabertooth 990FX, Corsair 120GB SSD, WDigital + 3x Seagate + Hitachi + 2x WD Ext = 10.0TB, Sony DVD, OCZ ZX 850W PSU, CoolerMaster HAF922, TM Warthog HOTAS, TM T-Flight Stick X, TM Cougar+FSSB & CH Pedals, Saitek X52 Pro & Pro Combat Pedals, TrackIR5 w/TC Pro, Windows 7 HP 64b