450 is a terrible card, I had 460 with my 2500k and it was playable, although much has happened since - so it could be even better now. But I say get a 7850 if you're looking for the best bang for the buck, it OCes all the way to gtx580 performance and costs about £160.
16gb RAM is overkill as well - 8 is plenty for now. Sell 8gb ram and 450 and get a 460 (not to waste time until xmas).
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