Antec 900 2...yummy ...1200 is yum yum 2 but prob not in this case.
Off is an understatement on that NZXT Alpha... Antec 300 for sure for a budget gaming case.
Samsung SH-S223F if you don't need Lightscribe.
PCP&C Silencer 750 or Corsair 750TX to leave room for Crossfire. Of course you know that the red Silencer 750 is the best deal.
If you're just gaming, then consider the OC'd E7400 & E7500 if you're on a tight budget.
Obviously, in this case the mobo should be the Gigabyte EP45-UD3P.
That looks good. Good job choosing the parts.
Another +1 for an Antec case - I love my 900. Great cooling.
Yeah, that looks good. I'll second Akebono's choice of the Gigabyte EP45-UD3P. The Silencer 500 is enough, but if it will fit [the budget], a bigger PSU does provide substantially more headroom. Cases are a big personal preference item, so whatever he prefers that fits his budget.
Edit: added "[the budget]"
The Silencer 500 works, but just barely. I'd prefer the 610 for a little more margin and future expansion capability. I'm with jtt283--it depends on the budget.
Just for reference, the 500 has 35A on the 12V rail, while the 610 has 49A--big difference.