6 gig of ram is plenty if you ask me. I manage dalaran with 4 gig tho that is on minimum settings. In my opinion £439 is way too much to spend on a graphics card. You will only need a card that powerful if you are planning on playing games at high resolution on a large screen. Id personally go for a GTX 260 or 4870 as you say for around £200 then spend the extra cash on getting 2 good HD set up in Raid. Someone linked an article on read/write speeds in Raid setups the other week but I cant seem to find the link now.