You did not mention cost as a factor in your decision but I was faced with this decision a couple month ago. I chose the Phenom II X4 955 BE. Honestly the cost difference between the 965 and 955 is far greater than the difference in performance. The same can be said for the new Six Core AMD's. Great for number crunching and the novelty of having the latest and sorta greatest but if you boil it down you get a worse gaming performance.
I would say saving anywhere between 20-150 dollars on the CPU and spreading that money to GPU, Mobo, Cooling and hard drive performance would really fuel your gaming machine to a new level. So to answer your question: 1. Probably better to go with 955, 2. If not 965, 3. Could go with 1055T but only for novelty.