Call of Duty: Black Ops
While Black Ops isn't one of the most technically brilliant games available on PC, it's one of the biggest games of all time and runs far better in 3D on PC than on consoles. On the consoles you lose the smooth frame rate the series has become known for, whereas that isn't compromised on a PC.
Just Cause 2
Just Cause is a slightly smaller franchise than some of the others on this list, but Just Cause 2 has the best 3D we've seen. The huge open world comes alive when played in 3D and Rico's aerial stunts look amazing. It helps that the PC game looks significantly prettier than its console counterparts, so you're getting the best possible experience on PC.