Rollers will definitely hold your atttention more - and they're not near as boring because of it. Additionally, you can also get resistance units for them. However, you can't do some work-outs like one-legged pedalling, standing is MUCH harder, etc.

You can find a cheap trainer like a mag trainer or something for under $50Cdn if you look. The better quality you get the more realistic the resistance will be. (With the fluid trainers being the best.)

It's cooling off here in the GREAT WHITE NORTH and my outside riding days are numbered.

Now, if I can just get my diet under control.