I would love a stationary bike too, for when it gets so hot here that it is hard to ride outside...
But I really don't like recumbant stationary bikes that I have used in gyms (granted maybe there are better ones, I've only tried 3-4 different styles), but they just really hurt my lower back no matter how I adjust the seat/leg etc
On the other hand, my DH loves the recumbant. So I'd say to make sure to really try out whatever you think you might buy to make sure it is comfortable... maybe you can find a good deal on craigslist!