Go for it! I was tired of gaming, bored
The 3D-experience kicked it up a notch.
At first I had an 8800GTX but it couldn't handle the 3D-graphics that well. But then I thought I would go all-in and bought the following:
Three Samsung 2233rz monitors
Two GTX 470
And this crushed every game I threw at it. I can recommend the MSI GTX 470 for its marvellous overclocking software. If you are getting new graphics this is the one. In this software called "MSI Afterburner" you can have different profiles, that notices if you enter a 3D-application and then applies a certain profile. Or you can bind a profile to a Key-command like F6. I have a standard clock at desktop and a 30 PERCENT OC when I enter games. This card can be overclocked just beautifully!
I'm glad that you're thinking about joining the third dimension and I will supply you with a short list here of what games I think are really... well.. dazzling or just borderline amazing
Call of Duty: MW2
Battlefield Bad Company 2
Mafia II
Left 4 Dead 2
Mount&Blade
Medal of Honor
Team Fortress 2
Well, there are lots of games that I've tried, there are several more that are beautiful in three dimensions, but this should be a start.
You are also saying that you think about upgrading your processor, I don't think that would prove very prudent though your processor is just fine. It wont be much of a bottleneck if you are just getting a GTX 470, if you're getting two, fine then you have a problem, but one should be perfectly fine.
Edit* Oh, and I wouldn't agree with the previous post. The eye-wear do not strain my eyes in any way. I can sit for hours on end.