Personally:
I'd only buy veggies and groceries from Tesco's - spend your club points on them.
Acer's are ok at entry level, but then again I'd rather have a custom build for £500 or less from a SHOP that Specialises in computers, not a supermarket - Oh yeah and I wouldn't touch microsoft with a barge pole anymore - Linux or Mac OSX for me now, its soooo much better.