the 960T is a Phenom II X6 with two cores turned off -- and can sometimes be unlocked. The Phenom II is actually faster than the 4100 (which should be treated as if it was a dual-core chip), even if you don't unlock the extra cores.
for $5 more, I'd consider it.
Also on a 970, with just a single PCIe x 16 slot, you can step down to the CX 500 instead of CX 600, which is $12 cheaper as long as you stick with the 6870 or a GTX 560
for ypour RAM, get the Patriot 8gb DDR3-1600 for $34.95 at NEwegg. Faster than the DDR3-1066 you were looking at, for less money.