Will this build be sufficient?

[killianzz]

Intel Core i5-2500K 3.30GHz (Sandybridge) Socket LGA1155 Processor - OEM £173.99
(£144.99) £173.99
(£144.99)
Asus ATI Radeon HD 6870 OC 1024MB GDDR5 PCI-Express Graphics Card £165.59
(£137.99) £165.59
(£137.99)
MSI P67A-GD65 Intel P67 (Socket 1155) DDR3 Motherboard - (Sandybridge) £134.99
(£112.49) £134.99
(£112.49)
XFX Pro 650W Core Edition Power Supply £68.99
(£57.49) £68.99
(£57.49)
Coolermaster CM-690 II Lite Dominator Case - Black £61.26
(£51.05) £61.26
(£51.05)
Samsung SpinPoint F3 1TB SATA-II 32MB Cache - OEM (HD103SJ) £42.98
(£35.82) £42.98
(£35.82)
Titan Fenrir Evo CPU Cooler (Socket LGA775/LGA1156//LGA1366/AMD K8/AM2/AM2+/AM3) £31.98
(£26.65) £31.98
(£26.65)
OCZ Special OPS 4GB (2x2GB) DDR3 PC3-12800C8 1600MHz Dual Channel Kit (OCZ3SOE1600LV4GK) £31.19
(£25.99) £31.19
(£25.99)
Samsung SH-S223C/BEBE 22x DVD±RW SATA ReWriter (Black) - OEM £11.99
(£9.99) £11.99
(£9.99)
Sub Total : £602.46
Shipping cost assumes delivery to UK Mainland with:
DPD Next Day Parcel
(This can be changed during checkout) Shipping : £11.25
VAT is being charged at 20.00% VAT : £122.74
Total : £736.45

Gives you the option of overclocking if you decide to

E: Perhaps look for a case that's quieter, not too sure on how loud the cm690 is...

Really like the sound of that. I think I might need a slightly beefier PSU as I will probably crossfire another 6870 in a couple months.
Ive pretty much got my heart set on a white nzxt phantom case, acquired taste I know but I also like many of its features, such as the built in fan controller which would be handy when switching to htpc mode Is that CPU cooler any good? I was going to get a Noctua DH-14 in a couple months or so. I dont think I want to do a serious 4ghz+ overclock, a 3.8-4ghz perfectly reliable clock, running as cool as possible so hopefully it wont affect its lifespan. Reading all these reviews on the sandybridge is starting to convert me ( sorry amd ) You think this rig with xfire 6870s will last me 3 years? That would be ideal, then I could get a completely new beast.