My work sells both Sony Vaio and Acer laptops. I've got a Sony Vaio myself, and prior to that I've had about 3 different acers. I found the Vaio to be superior in many ways, and wont be buying anything else. Yes they're expensive, but you actually are paying for the quality. Only prob is that now they're all running Windows Vista, which I find terrible.
What we need to know though, is whats your budget. With cheap entry level laptops, you are getting what you pay for, and it doesn't really matter what brand you buy. Not saying thats a bad thing, but being in the industry and seeing a whole range, theres a big difference in performance & quality if you are willing to spend an extra $500