I can slightly appreciate your physical challenges as my wife faces many herself. A lightweight recumbent trike will put a pretty good dent in your pocketbook and itís not an investment you should take lightly.
I would suggest that you open discussions both on the Recumbent portion of Bike Forums and especially on http://www.bentrideronline.com/messageboard/index.php
The folks over at bentrideronline (BROL) are recumbent enthusiasts.
You should also look for bike shops that specialize in Recumbents and will offer you opportunites for test rides. Recumbent shops are few and far between so be prepared to travel. Rest assured, the trip will be worth every penny you invest as knowledgeable staff and test rides are what new recumbent shoppers need. There's nothing like riding a few different trikes under the watchful eye of a knowledgeable staff to help erase some of the confusion that internet overload can sometimes create.
A good shop in New York State is Bicycleman in Alfred Station N.Y. He also has a very informative web site. The folks over at BROL can direct you to a good shop in your part of the country.
Last edited by cranky old dude; 04-08-11 at 07:09 PM.