I am looking for a bike trainer to get on my bike dureing this cold season. I am not training for any big race. I have a long bike tour in july. But I just need to get up and getting some miles under me. I want to keep cost down. What is a good one at a decent price. Are there ones that are better. I have read something about fluid ones . Any help at knowing what to buy with out over buying for my needes. IS a roller trainer better. ??????? I just want to get back into shape and work on building my bad knee back up.