On the RAM, the main thing that's changed is that you need to make sure what you buy is on the board's QVL. I don't think that's the same RAM (the one you have listed) as what they have on the QVL for your board, so you may want to rethink it.
Also, you might look at the GA-P35-DS3R. It's the supports the same things but has more features (at roughly the same price)...not sure what you're looking for though.
Lastly, I've never heard of "Rosewill", but I know that the Corsair 520W will support what you have listed. Buy.com has a great deal for one at about the same cost (after rebate), and you DEFINITELY don't want to skimp on a PSU. I also recommend buy.com because they really have their chit together. Ordered - Saturday...shipped - monday morn...arrived - yesterday. It's the only part to my new build that's here already.
*edit* Nevermind on the rebate towards the PSU...must have been another component. My bad, it's $100
There's this power calculator to give you an rough idea of what you'll need. If you can spend $100, the Corsair 520w is pretty good, but I have limited knowledge on what's best bang for your buck in this area, so others might know more...