i really wouldn't say definitely tknick.
I mean, if you get a 790gx board for the time being, and a 720BE, then upgrade to an AM3 board later on, you can save alot of $$, especially since Intel will be stuck with DDRII and the 775 boards, whereas the AM2+/AM3 are interchangeable. DDRIII isn't very cheap now, but you can toss a 720BE into a 790gx board, overclock to 3.7ghz on air, and you have 11.1ghz of power. REAL power that ALL apps use. I forgot where, but it's shown that during games the first 2 cores (even games that are 'designed for quad') are at 100%, then the other 2 are at 70% on load. With a triple core you get 2 @ 100% and one at 95%.
Anyway. Intel may be the better pick NOW for this month. But the 775 boards don't have a future, and if you want to upgrade past 775 you'll need a new motherboard, ram, and cpu all at once - the AMD route means you can grab the motherboard or CPU first, and it'll still be a running system, and you can use cheap DDR2 ram now, and DDR3 later, when it comes down.