The first board has no multi-GPU support but it supports even Phenom II processors.
The second one has multi-GPU support but doesn't have good processor support. Only limits to Athlon 64+ and similar.
I say go for the first board. You'll get a good processor then and a single card will do wonders to your system. You can get killer combo of Phenom II X4 955 and HD 6850 (or 6870 if you can spend extra) with this board.