How long will this system last if I invest in it?

[ByMRK1]

Ok, I have come up with my final build list, and I've thought about it, and come up with the idea that I will save all my money and invest into this pc. But Im spending a lot for my age (14) and I am hoping this will last very long. And tell me if there are things in it that I dont need and will help lower the price. But I think the price of the processor will lower as Ivy bridge comes out.
Used for: Video editing (After effects & Sony Vegas), Graphics Design (Photoshop), Gaming (Call of duty's, BF3)
Resolution: 1920 x 1080
What I can use from old system: DVD Rewriter, 500GB HDD, 1 Led case fan.
And can I get some money back by selling these on the mm: AMD Athlon II X3, MSI 870-C45, 8400GS.

-Gigabyte Z68XP-UD3P Intel Z68 (Socket 1155) DDR3 Motherboard

-Corsair Vengeance 16GB (4x4GB) DDR3 PC3-12800C9 1600MHz Dual/Quad Channel Kit (CMZ16GX3M4A1600C9) [CMZ16GX3M4A1600C]

-EVGA GeForce GTX 580 SuperClocked

-Crucial RealSSD M4 128GB 2.5" SATA 6Gb/s Solid State Hard Drive

-Western Digital Caviar Black 1TB SATA 6Gb/s 64MB Cache - OEM

-Corsair Hydro H60 High Performance Liquid CPU Cooler (Socket LGA1366/1155/1156/775/AM2/AM3) [CWCH60]

-Corsair Graphite 600TM Midi Tower Mesh Windowed Case - Black [CC600TM]

-Lepa B-Series 850W '80 Plus Bronze' Modular Power Supply

-Intel Core i7-2600K 3.40GHz (Sandybridge) Socket LGA1155 Processor - OEM [BX80623I72600K]

Total: £1373

 

[ByMRK1]

Ok, Will I need the new hard drive if I currently have a 500GB Kingston?

 

[ByMRK1]

2-3 Years?? :O

 

[ByMRK1]

Could you spec me a better one for the same price?

 

[ByMRK1]

This pc will be used for video editing and photoshop? Shouldn't their be at least 8GB ram and maybe a Core i7?

 

[ByMRK1]

Also I would like to be able to get 250 FPS in Cod4 at 1280 x 720. Everything on medium? And 60 FPS Constant in WoW. And Skyrim, I would like to run that smoothly with eye candy.