1)God of War 3 - God of War 3 is still one of the most visually stunning games out there. I know it used a lot of "tricks" to achieve that, but higher resolutions and 60fps alone would make it amazing.
2)Uncharted 2 -The Uncharted series is another one that looks great for what it is, but it would be mind blowing on the PC.
4)Halo Reach - Halo Reach has an excellent art direction, but in my opinion the only thing that held it bad was performance issues. It would be a stunner on the PC.
5)Metal Gear Solid 4 - Metal Gear Solid 4 was a great looking game that I absolutely loved, I would pay $60 for a PC version.
6)Gears of War 2 - The original Gears of War on PC plays so smooth at 60fps. It's sad the the others didn't make its way to the PC and I would love to see them get ported. Here's hoping for an E3 Trilogy surprise!
7)Gears of War 3
8)SSX - I'm a huge fan of the SSX series and felt the SSX reboot was a very good reboot. This game would benefit hugely with the 30fps cap removed.
9)WWE 12 - There's never been a good wrestling game "officially" released on the PC. Higher Res textures and resolutions would do wonders but I would mainly want to see what the mod support would be like. Seeing as what has been done with No Mercy, the mod community would be able to do something amazing with this.
10)Little Big Planet 2 - Mod support, plain and simple.