Need a bit of help on choosing a spin bike or a elliptical. I have a magnetic bike now and have used a spin long ago and tried one yesterday and I am sold. My room only has enough square footage for a bike or something that is only going to take up a 3'x4' area. I just missed a used one a Sunny Fitness Model 901. I see Wal Mart has these for $249. They have the 40lb wheel and chain drive. If Wal Mart is selling the same one others are and not a cheeped up model this looks good. There are Schwinn IC2 out there for less than $400, but there wheel or hub is 30lb. I ride bikes infrequently and want some cardio for my wife and I. I have not researched the elliptical, but they are a option, but think the spin bike would be a better choice for myself, my wife would lean elliptical. Certainly would like to here some advice on this.