You do not need a high spec card for photo-editing but the more RAM the better although a Quad processor should help. PB computers, contrary to what has been written, are very good and Dell are excellent. I would give Cougar a ring and have a chat.
If you want the computer quickly, go to PCW and hand over the readies. You will have it up and running in a hour or so. Dell are very good value and superb build quality, they are also very cheap, especially as some of their computers come with 20" screens but if you can afford it upgrade to 22", you will not regret it. Personally I would spend most money on he screen as you will use this the most...stuff an expensive graphics card.
AMD64 x2 4800+ Dual-Core Processor Hard Drive Size 250Gb SATA 300 RAM/Memory Size 2Gb DDR2 667Mhz Black DL DVD Writer 512Mb Nvidia Geforce 8600GT Super Graphics Card (Ultra fast card, ideal for games and video editing. Supports direct X 10! 22inch Wide Screen TFT
That's knocking out at £499
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