adjustment is easy enough for you to do on your own. the more fancy bells and whistles on the control panel, the higher the cost, dont buy what you wont use. a well made quality treadmill will run you about $1,000 or more .try to get a least a 2 year written guarantee on moving parts and 2 years on the frame.
the only way to get fit and stay that way is through, a program of proper nutrition and exercise. a fitness routine is like a marriage, if you arent committed it wont work. 