PSU - to OC and use two GFX cards, you'll need more than a TX seriesto maintain fgood stable voltages. The HX series is $40 more than the XFX.
GFX - The 570 is evenly matched against the 6870.... and will well outperform the 6850 unless you flash it successfully (and void ya warranty) . However, two 570's in SLI outperform two 6970's so that's what gives the 570 the nod.
RAM - no advanatge to more than 8 GB in 1155 / 1156 so not filling all slots for future upgrades doesn't apply.
Cooler - The 212 is substantially outperformed by the Mugen 2 for just $8 more
So would I be better off going with the HX series PSU or the one that you recommend?
According to the reviews on newegg the mugen 2 is somewhat difficult to install as I am a noob when it
comes to install that concerns me alittle. Also would that cooler work with the new Sandy Bridge architecture?