Gaming PC would like opinions and reasons why please.

Ok so this was a computer i was looking at on Cyber Power. I edited some stuff on it. ( I dont know to much about Hardware for computers more software kinda guy.) All advice would be very helpful, but please give reasons why. If you have any suggestions on what i should switch out and put in please list. I would also like this computer to be able to be modified for future gaming so keep that in mind please. I play RTS (Starcraft and shogun) FPS (crysis and BF3) MMORPGS, RPGS, and preety much all games you can think of. I also would like to be more enlightened on the diffrences between HDD and SDD . I have a external hard drive 1TB so wasent really gonna worry about storing stuff on actuall cpu.

Configuration
Casing : Thermaltake Commander Mid-Tower Gaming Case ( was wandering if should get a bigger tower for repacing stuff ?)
Extra Case Fan upgrade :Maximum 120MM Case Cooling Fans
cooling fan: (Venom Boost Extreme OC Certified) CoolerMaster Hyper 212 Evo Gaming Cooling Fan
Power Supply: 800 Watts - XtremeGear Gaming Power Supply - Quad SLI Ready
CPU: AMD Phenom™II X6 1100T Six-Core CPU w/ HyperTransport Technology
HDD: * 60 GB OCZ Agility 3 SATA III 6.0Gb/s SSD - 525MB/s Read & 475MB/s Write (Single Drive)... (Also it says SSD not HDD)
MEMORY: 16GB (4GBx4) DDR3/1600MHz Dual Channel Memory (Corsair Vengeance)
MOTHERBOARD: [CrossFireX] GigaByte GA-970A-UD3 AMD 970 Socket AM3+ ATX Mainboard w/ On/Off Charge, Ultra Durable™3, 7.1 Audio, GbLAN, IEEE1394a, USB3.0, SATA-III RAID, 2 Gen2 PCIe X16, 3 PCIe X1 & 2 PCI
SOUND: HIGH DEFINITION ON-BOARD 7.1 AUDIO
VIDEO: AMD Radeon HD 6850 1GB GDDR5 16X PCIe Video Card (Major Brand Powered by AMD)


Heers the original link if you would like to just repost what you had made and tell me why you had done that.

http://www.cyberpowerpc.com/system/Mega_Special_I/

Thankyou very much for reading this thread and for all future help!

Email : Stomarchh@live.com

(also new to website so im not sure if im in right area of Forums for this)