£600 is not bad depending of what you go for you could get it for cheaper. There's only one thing that would put me off the one on ebay and that's the gfx card the 9250 is ageing very fast compared to the newer gfx card but if your not a hard core gamer then it would do you fine but £749 is still too much for me in my opinion Depending on ware you shop you could get a mobo, cpu and ram for under £396 leaving £353 for the rest. Folk always tend to point the applications when selling pre built pcs most of the time it's just for show because a lot of people don't use the software or have now use for it.
cheers for advise i found out reserve for this £640, i'm not a heavy gamer so the card wouldn't bother me..so i'll see what bids it gets