To be honest, since you're going to use it for work, I wouldn't buy a consumer class laptop. I'd be looking at Dell, Lenovo, and HP's professional lines. Dell Vostro/Lattitude/Precision or HP (I don't know what their business class is called, ours are 6910p's) and Lenovo ThinkPads.
Dell Precision notebooks are specifically designed to do the kind of work you're doing. Might be out of the budget though- looks like they start at $1239 in the U.S.
thanks, but unfortunately most of these kind of laptops are over my budget and very few models are available here