I7 build, gaming machine.

The Antec 300 will fit everything but its going to be extremely cramped with that 1000W. Honestly, unless your using 3xSLI/CFX you wont need it. If you plan on just dual GPUs get a 750W. This will save you $100 on just the PSU and $150-200 on an additional GPU. In my opinion anything over 2 GPUs is overkill.

The Corsair RAM is expensive and has a high profile which could get in the way of your HSF. I found you some cheaper, quality RAM that will do exactly what you need.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Everything looks good. You are going to want a full tower case if you plan on using 3xSLI/CFX. And I would also suggest waiting to buy a GPU until the ATI 5870 is released. It will certainly drop prices on current models in time or you can buy the 5870.

5870 is supposed to be insane, like 2 4890's in one card while staying cool. I've read a review, I think on Anandtech, were 1 5870 was powering 4 monitors with ease while playing a single game!

PS: If you plan on watching Blu-Ray in the future you are going to want a better monitor. The Acer brand will not support true 1080p which will handicap Blu-Ray. LG is great, Samsung is nice too.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

If your just going to game and surf and have no intentions on Blu-Ray (you have a PS3 or something) stick with the monitor you have chosen. For the price, you can't go wrong. I wouldn't buy a Blu-Ray player for your rig anytime soon though. They need to improve the drives a lot. But this will "future proof" your monitor for quite some time.