Thanks so much for your feedback.
Front Seat, no I don't think I've got the expertise to put together my own machine. I'm happy for it to come already made from the shop.
Richard, thanks for the breakdown. There is so much information on the net regards celeron vs. pentium but it requires reading loads and loads of screen type that hardly makes any sense to me.
ck4707, as far as my Photoshop use goes it is creating multi layer graphics etc. Wouldn't say heavy usage but potential to be busy at times.
amanoffew, your comment just about has me sold on the P4.
Thanks everyone for your thoughts.
Cheers... TB