I have an old Gigabyte HD6850 that has a little trouble these days. I have done a few fan "repairs" (Re-oiling the bearings) but its a little old and I think its time to pass it on to the potential HTPC build :)
I mostly play in 720p (but thats a limitation I have put into place so it doesn't melt), and I have an old i5 2500 (not K - I will be upgrading soon as well) and I have 12Gb (?) of ram.
I know that a 780ti or a 290x is an "upgrade" but I don't wanna go silly with it. I don't have triple monitor at 1080p (yet lol).