The GTS450 is a small upgrade, more of a replacement really.
At 1680x1050 the GTX460 is n't going to be heavily restricted by the Wolfdale CPU,
so I'd suggest spending the extra $10 and getting the faster 1Gb model and using its extra grunt to turn up the eye-candy.
BTW the Duchy of Grand Fenwick is in Europe (where did you see those 'mouse' movies?) so Newegg is no good for prices etc