If you're going to buy something in the budget range, stray away from Dell. Only their business and XPS models are worth looking at.
Here's a quick rundown on major notebook manufacturers.
Apple - Good looking notebooks with Mac OS. Be prepared to pay a premium though.
Sony - The Windows equivalent of Apple. Like Apple, be prepared to pay a price premium. Known for excessive bloat ware.
HP/Compaq - Great business notebooks. Second to none on Thinkpads. Their consumer line is also getting praise.
Lenovo - Home of the famous Thinkpads. Known for great reliablity and a no thrills design. Great keyboards and ergonomics. Quality has slipped with IBM out of the picture though.
Dell - Getting great praise for their XPS lines. Their other notebook lines are decent and average.
I would stick strictly to those manufacturers if I were you.