tricia, do you have a budget? I'm guessing you want something in the low hundreds?
If you do, I'd look at something like a gazelle instead. My mom has a gazelle and it works (although it is squeaking and annoying to me). It just costs a lot of money to make a good elliptical because of the parts involved. The cheapest elliptical recommended by Consumer Reports is about $900.
Another option would be an exercise bike. You can generally buy them for a couple hundred dollars.
I personally spent over $2000 for an elliptical and part of the reasons was I really wanted an elliptical and the ellipticals that cost around $1000 were disappointing and flimsy. I got a LifeFitness and it is a great elliptical. I know a couple people on the forum have the same one and also really like it.
If someone is selling a used elliptical for $175, you could definitely try it but I'd be aware that depending on stride length and also on quality, it could hurt your knees and it could fall apart relatively quick.
Is this the elliptical?
http://www.sears.ca/product/free-spi...ag=1#BVReviews
If so it has an 18 inch stride length which is the shortest I'd recommend on an elliptical. It also has 2 reviews, one good, one bad.