Which budget gaming graphics card to buy?

So i'm thinking of buying a new graphics card to replace my GeForce GT 240. I'm having a hard time deciding between the GTX 550ti and the GTX 460, The GTX 560 is out of the list because its 200$ and a lot more expensive than the two i mentioned. I have a 500W PSU and my motherboard is a Biostar N68S3+. If any of you guys know a better card for the money then please respond

I'd suggest an amd gpu as they are better for sub $200

the 460 is a lot better than the 550 ti tho. The 6870 wich can be had for much less than $200 is more powerful than either by a substantial margin.

How about the AMD HD 6850?

6850 is around the same performance as the 1Gb 460 and just below a 6870 the way pricing is at the moment its worth the extra for the 6870 unless you find a bargain on the 6850.

an hd 6870 will be more powerful then the hd 6850 even an gtx 460 and its little bit comparable towards the gtx 560ti.

hd 6850 vs hd 6870 here u can see that an hd 6860 is 10-15% better then hd 6850.
http://www.anandtech.com/bench/Product/291?vs=290

hd 6870 vs 560ti
http://www.anandtech.com/bench/Product/290?vs=330

What power supply do you have? If its a good quality 500W then it will power any of the cards mentioned so far

Looking at Xilence PSUs there are a number of models and they seem to be low-medium quality. On the label on it what power rating does it give for the 12V rail or rails? For example this has 2 rails rated at 15A & 16A (Which is low for what they label as a 600W PSU)

I also forgot to ask how much 4pin connectors do i need for the HD 6850 and the GTX 460?