Right now you should consider an ATI 5770. It's supposed to be pretty decent for the price and it this one has a 6 pin power connector. The price/performance is good and should be able to run all of those games on all high. Even my 4830 can run most of those on all high, and the 5770 is even better.
Something like this:
http://www.newegg.com/Product/Product.a … 6814150462
The GTX 260s that I've seen on Newegg have been around $180+.
Also, here's a review for the 5770 for L4D. All high 2560x1600 the GTX 260 beats the 5770 at 106 to 82 fps. The GTX 260 has more power, but also consumes more power.
http://www.tomshardware.com/reviews/rad … 446-9.html
EDIT: Failgrammars and added stuff.
Something like this:
http://www.newegg.com/Product/Product.a … 6814150462
The GTX 260s that I've seen on Newegg have been around $180+.
Also, here's a review for the 5770 for L4D. All high 2560x1600 the GTX 260 beats the 5770 at 106 to 82 fps. The GTX 260 has more power, but also consumes more power.
http://www.tomshardware.com/reviews/rad … 446-9.html
EDIT: Failgrammars and added stuff.