Ive sold quite a few toshibas to clients over the years, but they want it for business and not for IT and gaming.
Just consider the video card and your ability to back up with a dvd burner, plus your budget.
Really your budget will dictate a nice 17 inch with a chunky vid card lappie.
there are tonnes of review sites over the internet for systems and parts.
toms hardware is an example of one of these. some people say they are not accurate, but you get a decent comparison, I know many computer shops that use their tests and benchmarks.