The GTX 460 is a good card and selling at a discount now because the model is being discontinued. You might also consider the GTX 560 (without the Ti) which is a little bit slower than the GTX 560 Ti but lower in cost - I think it is a good value buy - although the GTX 460 is a value buy too.
Here is a review of the GTX 560 - the benchmarks include comparisons with the 460 and 560 Ti. Read the summary on the last page, too.http://www.tomshardware.com/reviews/geforce-gtx-560-amp-edition-gtx-560-directcu-ii-top,2944.html
And here is a good choice for the GTX 560:
ASUS ENGTX560 DC/2DI/1GD5 GeForce GTX 560 (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card - $155 after rebate and a $10 promo code that ends 8/31http://www.newegg.com/Product/Product.aspx?Item=N82E16814121466