Questions from a noob

So im thinking this is gonna be my build
MOBO:EVGA nforce 780i SLI Motherboard $284.99 http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=3523225&CatId=3495

CPU:Intel Core 2 Quad Q6600 $199.99 http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=2643933&CatId=3406

RAM:Corsair Dual Channel TWINX 4096MB PC6400 DDR2 800MHz $86.99 http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=3228139&CatId=2261

Video Card:XFX GeForce 8800 GT XXX Video Card $140.99 http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=3606194&CatId=3668

HDD: Western Digital Caviar SE16 500GB Hard Drive $79.99 http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=2795126&CatId=2459

Optical drive:Lite-On LH-20A1S SuperAllwrite SATA OEM DVD Burner $24.99 http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=3189552&CatId=1624

Case/PSU:800-Watt PSU $119.99 http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=3685290&Sku=TC3J-2341

Well this is what im thinking about doing. And the few questions i had were:
Is this all compatible with eachother?
Is it all relible?
Is there anywhere i could save cash/spend a bit more to make it a lot better?

Thanks for the help in adavnced.

Ok, this is all definitely compatible with each other, and i've dealt with all these brands, and most seem very reliable.

The Only thing you need to consider is your graphics card, you're better off upgrading to something slightly better, because later on, you can throw in another one for cheap SLI. Consider getting a 9800gtx or something similiar. It will play today's games perfectly, and, if you later decide to throw in another one in SLI, it should last you 2-3 years