Bearing in mind you say you have no games to play at the moment, it indeed changes things. As far as GFX is concerned, just get something basic (or 1/2 decent but 2nd hand) to get you going... Let's focus on the processor and motherboard first though...
The thing that is most annoyingly slow now is dealing with videos. So bearing that in mind - more cores, or more clock? Some online have said that the more cores the better specifically for Premiere or Photoshop.
It's not quite that simple I'm afraid. Sometimes more cores is better, sometimes more clock speed, can depend on the application (and the architecture of the processor). Was reading only today how the new Sandybridge Core i3-2100, a 3.1GHz Dual Core processor at circa £90, can absolutely lay waste to an AMD Phenom 11 X4 840, a 3.2GHz Quad Core processor for similar money. So less cores, and lower clock speed, yet it significantly outperforms it!
And also, whilst more and more software is increasingly capable of utilising more cores, it's not like on Mac OSX where they're very effective at utilising as many cores as you can throw at them. There's little or no point in ever having more than 4 cores on a PC (Not long ago there was no point in more than 2), but on a Mac, hell throw 6, 8 or even 12 cores at the situation, they'll all help!
Anyway, if this is going to be a system to last several years, get your wallet out now and spend the money... If not, and your budget is tight, follow the advice in my previous post... But assuming you're prepared to spend the money... Here's what I'd get...
Gigabyte Z68 Mobo
4GB DDR3 1600MHz RAM
OK, that lot has blown your budget by some £60 or so, and you still don't have a GFX card in there, but the motherboard and CPU are the most important things in your case, and you don't wanna scrimp here. This combo will last you ages, and is ultra upgradeable. The Core i7-2600k might be £75 more than the i5-2500k, but it's about 40% faster again, and whilst you won't notices its performance advantage gaming, you will notice it drastically in video encoding and photoshop work, software that can take advantage of its Hyperthreading basically. You could save the money, and still have a bloody fast PC, but I'd spend the extra £75 myself and have one that I know will still be quick in 3-4 years time.
As far as RAM goes, just get 4GB to start. By using just one stick, you can always buy another (or another 3) of the same to double your memory quite cheaply. Better to go 1x4 than 2x2 in my book as you've got more upgradability still. Besides, unless you've got multiple applications all running at once, 4GB is enough for pretty much anyone still.
The Z68 motherboard (and that Gigabyte at £79 is a bargain for a Z68) allows you both the overclocking abilities of the P67 (VERY worthwhile with the 2600k processor, it was built to be overclocked, you can take it to over 5GHz!!!), and the built in GFX of the H67 chipset too. So to get going, if you're not playing games initially, you can use the inbuilt Graphics of the mobo! Personally though, I'd shop around for a cheap 2nd hand GFX card, something like the 8800GTX 640mb I have in my system can be picked up cheaply on ebay for about £25, and it'll still waste anything cheaper than about £60-70 brand new, and will play most games at decent frame rates and resolutions, if not Crysis at 1080.
SSD wise, well, if you can be bothered go for one... It will increase your boot speed and any applications you put on it. Personally though, I think until they're big enough and cheap enough for all your data to be on one, I'm not convinced they're wholly worthwhile. Buy a fast normal HD, like the Samsung F3 1TB I have (about £40 and the fastest 7200rpm drive out there), it's more than quick enough and you get a good amount of storage. Though you could be canny and take advantage of the SATA 3 that the Z68 mobo has, and buy yourself a SATA 3 compatible drive, which would theoretically double your read and write speeds.
Whatever you do though, wouldn't bother with AMD. You might get more cores, and higher clock speeds on paper, but in real life Intel processors trounce them these days, especially the newest Sandy Bridge ones.
Does that help?