I didn't hear back about the "better mobo" but I got an email from PC Case Gear saying they just ran out of E5200 stock but will check the stepping version for me. They are really good there. Fingers crossed it's the M0.
Yep no prob, also in August there coming out w/ that Game on Demand thing and it was about to be put up recently on xbox.com but MS took it back down so it looks like that might be part of the launch tittles for the games on demand and 20$ so yea there you go
The DLC with the bonus achs is the 400MS one. Can't remember the name. The first 50 points easy but beating the last boss sucks, cause you can't save anywhere before hand (making you play the entire DLC again!) There's a video guide on the forums which I think I'll try maybe this weekend.
Def use Achievers guide, and he's really helpful too. But yeah, worst ach if you don't follow it from day one! Don't wann end up like me and have to play it all over again.
Though you're right it is an awesome game. I really got into it in about disc two.