The current line of Toshibas (U300, A200, P200) have serious motherboard issues. I've seen a ton of them come back, not even a month old, w/ various problems related to the motherboard, most significantly and popular being that they won't power up at all. If it weren't for that, I'd probably recommend them because they have really sturdy chassis, nice screens, and good build quality all the way around while staying competitive as far as performance for the price goes.
Acer generally offers good bang for the buck and their customer service is awesome, but the quality of their chassis is **** for most of their budget (Travelmate & Aspire) series. I see tons of units where the chassis is cracking at the hinges.
Sony makes good quality laptops, but they're expensive for the performance you get and their service is complete ****.
HP is usually decent, but not the best quality. I'd say they offer one of the best products for the dollar at the moment. Same w/ Dell, but you get customer service from a person who actually speaks English.
I haven't use a lot of their laptops, but Asus seems to be a good choice as well.