What is the closest Nvidia comparable to the ATI Radeon HD 4870?

I currently have an ATI Radeon HD 4870 and it is perfect for my gaming-graphics needs, but I would like to buy the Nvidia 3D Vision Glasses Kit. Since this requires an Nvidia card, I will sell the HD 4870 and buy the closest thing Nvidia makes.

I think the GTX285

read a review on your current GPU. in the conclusion they will probably mention what you wanna know..........If I were you I would get something better! especially with crycis2 around the corner......

The GeForce GTX 260 is closest in performance to the Radeon HD 4870 ( http://www.tomshardware.com/reviews/gaming-radeon-hd-geforce-gtx,2676-7.html )Personally, if you're going to upgrade, I'd suggest going for the lowest of the new 400 series - the GeForce GTX 460 at roughly the same price as the 260, and 50% better performance.

The closest would be the 260.http://www.gpureview.com/show_cards.php?card1=564&card2=568