Recommended mobo for current setup

Hello I currently have:
AMD Phenom II x4 945 Deneb 3.0ghz
8 gigs gskill ripjaw series ddr3 1600
1x 300gb shitty seagate 300gig hd
palit geforce gtx 460 fermi sonic platinum oc edition 1gb 256bit ddr5
GIGABYTE GA-MA770T-UD3P AM3 AMD 770 ATX AMD Motherboard

I am planning on getting two Samsung spinpoint F4 320gbs and running them in Raid 0 but I feel my major weakpoint here is my motherboard? Am I currently bottlenecked by the cheap motherboard? Will I be if I upgrade my processor?

I currently don't have any plans of SLI/Crossfire if that factors into your advice.

I am just looking for some input as to which mobo would get the job done for me. I mainly just play world of warcraft, tf2, hl2, cs source, etc. No crysis, dirt, mwf2, battlefield any of the majorly intensive games. I also don't plan on overclocking.

Aside from going raid 0 with the F4s and upgrading the mobo, the only thing I can think of that I might upgrade anytime soon would be the CPU.

Any suggestions/thoughts/concerns/advice is appreciated.