Treadmill Advice!

I'm seriously considering getting a treadmill. Do people have favorite brands? Do you find it helps you exercise more? I don't want to spend buckets of money. What should I look out for?
  1. From my little research, these seem to be the stand outs: the NordicTrack 990...
  2. The Horizon Fitness T101
  3. My bed, and just not exercising