i'd definetly recommend one of the E8000 CPUs...the 8400/8500 would do you very nicely..
they are the new 45nm core CPUs so are very cool and higher performance then the E6000 series.
out of those 2 boards, i would suggest the ABIT, simply because it has 6 SATA ports instead of the ASUS having 4...thats about the biggest difference
now, if u plug your current drives into the new mobo it is possible (but unlikely) that the raid controller will pickup the existing raid...though i do doubt it.
if you create a new array, you will loose all your data...
the only definet way to get it off is to find someone with working system with SAME motherboard you had, and plug them into there.
there are programs that can get data off failed raid arrays, but are INCREDIBLY slow and they are never 100%.