Congrats on getting that cast off! Riding the bike has been great since I'm still not ready walk a long distance without crutches.

I went out to a couple of the sporting goods store nearby and picked a bike that was comfy and cheap ($150). It's called the Lifegear Uprite deluxe. Eight resistance levels (I haven't got past #2 yet) - I'm happy with it so far. (Considering my PT sessions were costing $80 each the bike seemed like a bargain!)