Re: MotherBoard+GPU+HeatSink Q's
Personally, I'd take the 4890 over the 260, even the core 216 version. Better performance, but I think for the price, you'd do better with the 260 unless you have a big hi-res monitor. The 4870 should also be an option.
I can recommend any ASUS board, but I'll let someone with 1366 experience help you with that one.
Account no longer active. Contact info available in profile, if anyone cares to reach me.