Yup 560 Ti FTW!!!
If you are going to get the 506 ti, spend a few more bucks and get the MSI Twin Frozr.
They are beastly. I can overclock mine to 950Mhz without voltage mod and still run very cool. around 55C at load.
I'm sure upping the voltage I can break 1000mhz no problem. I'll do that when I need more power!
Anyway, if you want the MSI 560 ti DirectCanada still has the lowest price currently. So pm at Memory Express to get even lower price