Crysis obviously has superior graphics. Far Cry is the superior game.

Some of my personal favorites over the last few years:

Elder Scrolls Oblivion (heavily modded) & expansion, Bioshock 1&2, Mass Effect 1&2, Fallout 3, the STALKER trilogy, Crysis, Warhead, Metro 2033, Unreal Tournament 04 and UT3, The Witcher, Left 4 Dead 1&2, Dead Space, World in Conflict, FEAR 1, FEAR Extraction Point, FEAR 2, Battlefield BC2, Wolfenstein COD4, Cryostasis, and Dragon Age.

Going back a little further are great games like Doom 3, Far Cry, Quake 4, Half Life 2, RTCW... and more..

Basically the fact you are a new PC gamer with a nice gaming rig.... opens up so many possibilities with all the fantastic titles that have come out in the past decade. Perhaps since you are so far behind you should play some earlier games fully maxxed out and then work your way to newer titles so you can appreciate the evolution of graphics and gameplay. Like play Far Cry and then play Crysis or FC2... there are many options you have.

I know that Dirt 2 comes with XFX, Sapphire and some Gigabyte 5850's, or at least it should.. But anyways, I went from a GTX 260 SLI setup to 5850 Xfire and I saw a nearly 10k jump in 3dmark vantage GPU score. These 5850's are great and they run cooler and quieter than my 260's did.