Getting the higher power PSU for SLI isn't necessarily a worthwhile investement as SLI seems to be more of a now or never type deal. The card you've chosen will run current games well and keep on doing so for a while. By the time it's worthwhile to put in another in order to keep playing games well chances are there will be a newer series available and you won't even be able to find your current card to match. I was running a 3870x2 for about a year before I figured it might be worthwhile to crossfire and by then I couldn't even find my card since it was all 4800 series everywhere and 3800 was no longer even being produced. Just my 2 cents.

Sounds good. You mentioned maybe having to sacrifice one piece for another. I wouldn't get faster CPU at the expense of the GPU. It's a gaming machine after all, it's only as good as the GPU. It's not like games even need the lowest GHz i7, whereas they can take full advantage of a savage GPU (although the 4870x2 will basically kill everything).

Everything you've listed should run together just fine. Even if you leave the 920 at 2.66 I can't imagine it'll bottleneck the video card you picked out. If by some black magic it does (which I doubt), the i7's overclock really well from what I've read. As for the PSU, I'd say you're playing it safe. Last time I tried running a setup with the PSU bang on what I was told I needed my system crashed; a bit more than you need is good and you're not way over.

-edit- Nice case, btw, I have the same one. It's so sweet.

I think you're supposed to use a different sort of thermal business if you're applying it to the bridges.

http://vip.asus.com/forum/view.aspx?id=20080420040329687&board_id=1&model=Striker+II+Extreme&page=1&SLanguage=en-us

That link talks about applying to bridges, says you don't want conductive like your silver for GPU would be. Good choice on the thermal stuff though, I got the same, knocked 5 degrees off my cruddy stock cooler on reapplication instantly and once it sets it apparently takes another few degrees off.

If you like RPGs and don't mind turn based combat go for King's Bounty: The Legend. Really fun, can do it all with the mouse.

Whether you get a wired or wireless Xbox 360 controller, you need the receiver. The USB plug only charges.

http://www.xbox.com/en-US/hardware/x/xbox360wirelessgamingreceiver/

^That's the receiver you'll need. Don't know if 3rd party ones exist. I got that one for my wireless 360 controller and it works fine.

http://www.microsoft.com/uk/hardware/download/download.aspx?category=Gaming

^That's where you get the required software. Just put in what it asks for and it gives you the right software. Don't use the disc that comes with the receiver, it's outdated.