Always good to have a 2nd set of eyeballs looking things over.
CPU/CPU cooler/MB/RAM: all very good choices. Can you find the P7P55D-E (not LX) version of that board? 2nd x16 PCI-e option there (x16/x4).
I couldn't figure out the exact model of that Geil Black Dragon RAM but I did find a review of a 8GB Cas7 kit
and a 4GB kit
that give me confidence your pick is a good one.
HDD/ODD: also very good choices.
GPU: HardOCP liked it a lot
Case & PSU: again, very good choices.
There are no dust filters on the side panel mesh or the empty fan position at the top of the case. You can probably 'field mod' to fix that.
It's a really well balanced system with top quality parts. -> But then you already knew that.