First, what's your budget?

If you have a few benjamins available - go for quality w/ a good warranty.

I did lotsa research before getting a trainer a few years ago, and narrowed it down to Kurt Kinetic or Cyclops. Called the experts @ Fitwerks, (they're regularly referenced in the tri mags), and they said go w/ Kinetic fluid trainer. Got it. Love it. No regrets. And then just last year there was a review comparing the 2 - and the Kinetic got the better review.

There's also a site TRIGEARREVIEW you could check out.