Originally Posted by
fsrgp
One thing I didn't mention is that I have a very bad back (3 fused vert. in lower spine), thats why I thought a comfort bike would be best (more upright sitting position).
Oh dear! You may even want to consider the dreaded "R" word - recumbent.
If you decide that's a possibility, don't waste your time with the people at a conventional bike shop. Find a recumbent specialist shop. Recumbents are a developing technology. There are many variations on the recumbent theme. They ride and handle quite differently from one another. People who don't speak fluent recumbent aren't going to be able to guide your decision.