Sorry to hear about your injuries.
The Good: From the input I've read over the years, I can say the Spyder is a good choice. The comment above about the RS seating position not being hard on your back is correct, it is a little "sporty", so you are leaning forward, depending on where your back hurts, this could be good or bad. If you need a more upright position, use handle bar risers on the RS (of course the the RT delivers that too, but for a lot higher $'s). It is hard to find a more comfortable and safe ride in the open air.
If the Spyder is new/on MSO, than the warranty will not start until you buy it

Make sure all service bulletins have been performed and tested......
Another good thing, Spyders seem to hold their value pretty well, partially because of the uniqueness (no competition in the marketplace), and some because of the price for new ones rising from year to year.
The Bad: One downside for you I see might be the 200 miles from the dealership thing. That could end up being a hassle if you need much service and/or do not do the basics yourself (oil changes, etc)The Ugly: hmmmm, can't think of any.
Be sure to try and set up a test drive, that is the only way you'll know for sure it will be a good fit.
We hope you are enjoying a Spyder on the road soon