I personally prefer the 460 for the drivers among other things, but the performance of the two cards is close.
Although buying OC'd cards is not always a bargain - and you can often do it yourself - the exception is this OC'd 460:http://www.newegg.com/Product/Product.aspx?Item=N82E16814125333
which, at $182 after MIR including shipping is cheaper than all but one 1GB 460 (that I wouldn't recommend in any case) at Newegg. Always check the shipping costs at Neweeg because they often play games juggling price, MIRs, and shipping. To me, its the total net cost that counts.