still have no idea why you want 16 gbs of ram.
G.SKILL Ripjaws Z Series 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9Q-16GBZL
with that 10% off code it's a good deal. and it's a bit faster than the crucial, although not by much.
if you are set on Evga that's fine.
I'd go with the MSI, just because its cheaper.
MSI N550GTX-Ti Cyclone OC GeForce GTX 550 Ti (Fermi) 1GB 192-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
when it boils down, its the same chip inside, same performance = more bang for your buck with msi.
I was able to fit a 9 inch card (8800GT) into the previous generation of HP media center, M7xxx series.
the outer appearance looks similar, I had figured the innards might be similar too.
its a tight fit, but it works.