Because I have a 32-bit OS, it only recognises 3.49GB of RAM, even though I have 4GB physically - the point I'm trying to make is that even though the full 4GB isn't recognised for me, I have never gone above 70% usage (to my knowledge, anyway). And we're talking about RAM-heavy Vista here, too.
I do alot of gaming, music editing, photo editing - everything that needs RAM. And I've never had an issue.
If you do transcoding that infrequently, you're best with a 2500k. Are you going to be overclocking at all? If not, you'd be even better off getting the non-k edition (limited overclocking capability compared to it's "k" brother) for about £20 less.
Just saw your prices, by the way. If you can get 8GB of RAM for £55, that's an absolute steal. So f**k it mate, you might aswell go for it.
Its already overclocked to 4.5ghz Reslivo.
This would be the alternative taking onboard your suggestions :-
Case
Antec 300 Three Hundred, Ultimate Gaming Case (£40.30)
CPU
Intel Core i5 2500K Unlocked, Sandy Bridge, Quad Core, 3.3GHz, 6MB Cache (£131.15) 1
CPU Cooler
Coolermaster Hyper 212 Plus - Performance Cooler (£15.69) 1
Overclocking
Intel Core I5 2500K professionally overclocked by our 3XS enginners to 4.5Ghz. (£0.00) 1
Memory
4GB (2x2GB) Corsair XMS3 Classic DDR3 1600Mhz 1.5v (£30.40) 1
NVIDIA Graphics1Gb EVGA GTX 460 SSC, 850Mhz GPU 336 Cores, 3900Mhz GDDR5 (£119.46) 1
Power Supply Unit Compare
600W Corsair CMPSU-600CX (£41.98) 1
System Drives
1TB Samsung Spinpoint F3, 7200rpm, 32MB Cache (£32.98) 12
Optical Drive
Samsung SH-S222AB/BEBE 22x DVD±R, 12x DVD±R, DVD+RW x8/-RW x6, SATA, Black, OEM (£12.22) 12
Sound Card
7.1 On Board Sound (£0.00) 1
Microsoft Windows 7 Home Premium 64bit - OEM (£58.07) 1
Extended Warranty Compare
Standard 3XS System Warranty - 1 Year RTB (£0.00) 1
Total
£763.72
Base Price: £154.18
Your PC: £636.43
VAT: £127.29
I stuck an improved graphics card in and added a sound card.