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470's do run fairly hot by most accounts and quite noisey but a custom cooler or water cooling set up would take that possible annoyance away. I'm not saying defo get the 470 but do bear in mind they are at an excellent price atm.
1680*1050 with 500W OCZ PSU. I did think about the 470, but a lot people have said they are quite noisy plus runs hot.
http://www.overclockers.co.uk/showproduct.php?prodid=GX-092-MS&groupid=701&catid=56&subcat=1830
The above card is class, going from an 8800GT to the 460 will be an immense performance increase.
When you consider such options, you always have to bare in mind the extra cost that comes with it. After market coolers are generally at least £20, water blocks at least £40.