If you want a non-SLI board with a little overclocking headroom, then a micro-ATX board like the GA-MA74GM-S2 or the ASUS M3A76-CM is perfect for you. It also supports your CPU as well as the new Phenom II CPUs, in case you feel the need to upgrade in the future.
Yep, they both do. PCI-E 2.0 is a moot point though, since PCI-E cards are backwards compatible with PCI-E 2.0 slots, and vice versa. Also, there is no advantage to using a PCI-E 2.0 slot over a regular PCI-E slot.
Both mobos will allow a light OC BTW, maybe just the amount you are thinking of.