Hi all, first post today 
Right, I'm 18 in August and have trust fund money coming through so I've decided to spend about £1400 to £1600 on a custom gaming rig which I will put together my self. Now this is something that I have never done so I'd be grateful if you guys can give me some tips and opinions on the components I've selcted and also give me any hints and ideas or if there are any new and better components coming out between now and August/September. I'd also like to know if I'll need any extras for building myself eg thermal pastes, cables, connectors etc. I'll post my selected components below. Oh btw, I'll be using a Dell 20" 2007WFP as my display so if you think I've gone overboard with the GPU's or anything please let me know lol.
Asus Rampage II Extreme Intel X58 (Socket 1366) PCI-Express DDR3Motherboard
Intel Core i7 920 D0 Stepping (SLBEJ) 2.66Ghz (Nehalem) (Socket LGA1366) -Retail + Far Cry 2 Game
XFX ATI Radeon HD 4890 1024MB GDDR5 TV-Out/Dual DVI/HDMI (PCI-Express) - Inc. Tom Clancy's H.A.W.X & BattleForge - Retail
Coolermaster RC-1000 Cosmos Silent Full Tower Case - Black (No PSU)
Corsair HX 620W ATX Modular SLI Compliant Power Supply (CMPSU-620HXUK)
Microsoft Windows Vista Home Premium SP1 64-Bit - OEM (66I-01939)
OCZ Gold 6GB (3x2GB) DDR3 PC3-12800C8 (1600MHz) Tri-Channel (OCZ3G1600LV6GK)
Noctua NH-U12P SE1366 CPU Cooler (Socket LGA1366)
Seagate Barracuda 7200.12 500GB SATA-II 16MB Cache - OEM (ST350041AS)
LG GH22NS30 22x DVD±RW SATA Dual Layer ReWriter (Black) - OEM
This all comes to £1496.43 inc. VAT
Any help guys would be great.

Right, I'm 18 in August and have trust fund money coming through so I've decided to spend about £1400 to £1600 on a custom gaming rig which I will put together my self. Now this is something that I have never done so I'd be grateful if you guys can give me some tips and opinions on the components I've selcted and also give me any hints and ideas or if there are any new and better components coming out between now and August/September. I'd also like to know if I'll need any extras for building myself eg thermal pastes, cables, connectors etc. I'll post my selected components below. Oh btw, I'll be using a Dell 20" 2007WFP as my display so if you think I've gone overboard with the GPU's or anything please let me know lol.
Asus Rampage II Extreme Intel X58 (Socket 1366) PCI-Express DDR3Motherboard
Intel Core i7 920 D0 Stepping (SLBEJ) 2.66Ghz (Nehalem) (Socket LGA1366) -Retail + Far Cry 2 Game
XFX ATI Radeon HD 4890 1024MB GDDR5 TV-Out/Dual DVI/HDMI (PCI-Express) - Inc. Tom Clancy's H.A.W.X & BattleForge - Retail
Coolermaster RC-1000 Cosmos Silent Full Tower Case - Black (No PSU)
Corsair HX 620W ATX Modular SLI Compliant Power Supply (CMPSU-620HXUK)
Microsoft Windows Vista Home Premium SP1 64-Bit - OEM (66I-01939)
OCZ Gold 6GB (3x2GB) DDR3 PC3-12800C8 (1600MHz) Tri-Channel (OCZ3G1600LV6GK)
Noctua NH-U12P SE1366 CPU Cooler (Socket LGA1366)
Seagate Barracuda 7200.12 500GB SATA-II 16MB Cache - OEM (ST350041AS)
LG GH22NS30 22x DVD±RW SATA Dual Layer ReWriter (Black) - OEM
This all comes to £1496.43 inc. VAT
Any help guys would be great.