well its funny cos id go against what others have said and avoid dell like the plague, cos i had nothing but probs with my dell pc, trying to get through to them (in india) and get them to help you is nigh on impossible, others on here rate them but ive had nothing but trouble, so its all personal choice
same as vista i love it, been using it for 9 months now , everythings now compatibale and i have no probs, but at first i hated it lol
i must admit the last 2 lappys we have bought have been from tescos, simply because god forbid anything goes wrong, you just take it back and they just give you a new one (and after months of trying to get pc world to help us with the one before, this is ideal for us lol) we just keep regular backups and wipe them before they go back if necessary, (thankfully I havent needed to yet) mines a gateway and its ace, toms is erm.... oh cant remember sony i think, but they were both less than £500 and came loaded, dvd+RW drive, intel processor, 17" display, 120gb etc ,mouse, carry bag and bells and whistles lol
good luck in finding what you want hun xxx