My wife is worried about a few extra pounds and is convinced she needs a treadmill. I know that it will be used for several months and then stored in a corner of the basement. She won't take no for an answer and if I don't want to make her mad, and my life a living nightmare she will get a treadmill. Any advice? I have sticker shock, looking around so far, Sears has a good deal on a Proform XP 550e that she likes. But I have no baseline for comparison. Any advice will be appreciated.