You can upgrade to a corsair PSU for a few dollars more...it would be 500W instead of 600W...but that would still be plenty.
For the money on the i3, I would really recommend going to the FX6300 AMD, more cores is going to be better going down the road. I can't stress how underpowered the i3 will be in 1 year's time when more games that are designed like Crysis 3 and Planetside 2 and Bioshock Infinite are out...
4+ Core titles coming in the next 12 months:
BF4
GTA 5
Rainbow 6: Patriots
ARMA III
DmC Devil may Cry
Dragon Age III
Grid 2
Splinter Cell: Blacklist
Lost Planet 3
If anything on that list seems appealing to you...please rethink your dual core selection and choose a 4+ core CPU. The most bang for your buck option is the FX6300...but any current gen Quad that tickles your fancy would be well worth it.
For GPU, I would go HD 7850, and you picked a nice card...the Twin Frozr is a good choice.