It doesn't matter.
You want a AM3+ motherboard, not a AM3 motherboard. If you go AM3, you have no upgrade path. If you go AM3+ then you have upgrade-ability for the new AMD processors which are not out yet.
You can't use the board you chose for crossfire anyways, it's only 16x/4x pci-e. You want 16x/16x, 16x/8x, or 8x/8x.
In that price range for a video card your looking at a 5770 up to a GTX560, depending on what you want to spend and if you do rebates or not. Check the email specials and daily deals on newegg.