Well... the ASUS mobo runs $15 more than the Abit, and the CorsairXMS runs $60 (for a full gig) more than Kingston HyperX. So is cost is the concern here, the Abit with Kingston may be what you wanna look at.
For ALL shopping go to www.newegg.com
if you havent already. They have everything you need at lower prices than youll find anywhere else and their service is absolutely top notch. $2100 worth of PC components delivered to me in 4 buisness days recently. They are the best, and IMO the only, place to shop for PC parts.
Once again, any more questions feel free to ask away!