Why a laptop right now? With both desktop graphics card and RAM prices still inflated well over MSRP, the notebook space has never looked more attractive. A year or two ago, the price gap between desktops and laptops with comparable performance was significant. That's changing, and now we're paying an almost insignificant convenience tax to have desktop performance in a portable form.
Nailing down a high-quality mouse sensor is tricky without getting hands-on time with a given mouse. The two key sensor types are "optical" and "laser" sensors, but you can't apply absolutes when judging them. Your best bet is to try out a mouse in person, or to rely on formal reviews like ours, as well as online forums, for the skinny on how a mouse feels in specific play situations.
Dell Home, via its Member Purchase Program, offers its Dell 15.6" Laptop Gaming Backpack in Black/Red for $28.49 with free shipping. That's tied with our expired mention from four days ago as the lowest price we've seen for this bag. (It's the best deal we could find now by $20.) It accommodates laptops with up to 15.6" screens and features a shock-absorbent EVA molded front shield, adjustable shoulder straps, and a deployable rain cover.