for simply playing songs, belts are fine. But you're trying to spin beats, as you said, so you NEED gear driven, since the belt-driven turntables don't have enough torque to be able to sustain all the stops and go's even with the felt pad, not to mention they're not designed to take it...
Hell, if you're good, who cares if you use a laptop? Some of the indie nerds in the audience may complain... but have them get up and do what you do. Plus, if you wait, something MUCH better will come along.