Well unless it was just released today, I don't think its actually out yet. Unless we are talking about a differant board. The MSI K8N Neo platinum that anand has reviewed, is on its way, but not out yet.
Any nForce 3 250Gb board should support raid as its built into the chipset, the platinum board does support it, using both PATA and SATA drives. The platinum again has the newest realtek 7.1 channle audio. Not sure the specifics on it, but I would think it would be better then the older 6 channel one. I think as long as its in your price range, and you can wait a few more days/weeks for it to come out and it has all the features you want, then it is definately a board you should consider. I know I am .