I use our apt complex models so I don't know much about it. But someone is bound to say, "get an elliptical instead" but you can't get nearly as satisfying a workout on them, imo. I'd look at Craigs list to see what's available and then do some internet research on the models you can get for a 'steal'.
Philip, I.M.O. get an elliptical instead (sorry, couldn't resist!). I have a Vision Fitness X6000 DA, which is a double action model that gives you an upper body workout all while reducing strains on joints because you are not pounding the belt of a treadmill at every step. To me, walking a treadmill gets real old, real fast.
We did this just recently Phil. I can't suggest models, but I can say that Craig's List is definitely your friend on this one. Because of the weight of these things, people that buy them almost have to sell locally if they need to move or whatever. Plus if a gym goes under in your area, they might dump a bunch of pro level treadmills on the market (and again, they must be sold locally.) So a $2500 treadmill might go for $750 on craig's list, all you need do is pick it up. We found a $2300 treadmill for $600 delivered, barely used and 1 year old. Works like a charm.
I would try that. Go over to your area's craig list and search for "treadmill" to see what you get. Then check the models posted online for quality and snag a good one when it pops up. It might take a week or two but you can steal a major deal on a treadmill this way.
We have two Cartier Bodyguard treadmills here at work that get used heavily on a daily basis as we have a bunch of full and half marathon runners here. I've been running on them for 6 years now and found them to be comfortable and they never seem to break down.
Phil, Sorry I cant recommend a specific brand, but my brother had bad experience with one he had gotten from Sears. It set him back over a grand (I believe it was the best they carried) and had it repaired 3 times and replaced once in 1 month. The technician told him that with his weight (about 225) they were not designed to "run" on. He gave up on them. I would try to find a reputable fitness dealer and ask some specifics for high use. Good luck.
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Good luck to your treadmill hunting and I hope that you can pick the best for you!