If heat buildup isn't an issue in a small form factor case, I would go for the Athlon II 641/HD7770. But keep in mind, for gaming either combination is going to be weak at 1080p if that's your resolution. If this is an HTPC, either is more than you need for streaming, blu-ray, etc.
resolutions probably will be less than 1080p so no prob there
and i will have a coolermaster gemin ii m4 low profile cpu fan, big fan but short
the highest resolutions for any lthing max will be high not ultra