I have a Yamaha DTXplorer. Very good for learners and the price is fairly decent. Ran me about $1,100 a few years ago. You can find it at Long & McQuade for cheaper now, or an even better one for about the same price. You can hook computer speakers or headphones up to it. It sounds great and the triggers are pretty sensitive. It is a solid set.
http://usa.yamaha.com/products/music...pl/?mode=model
Most drummers are against electronic sets, but they are a blast and you can rock the #$%^ out at any time of the night. So worth it.