I think a lot of people here have the Travel Trac Technique PRO rollers from performancebike.com. Says it's out of stock right now, but can be had for under $150 including shipping when it goes on sale.

Rollers are good for short rides indoors, because they require a bit of attention and improve your handing a bit. If you are one of those freaks that can stand riding for 3 hours inside, I might suggest a trainer so you can watch a movie and zone out.