Just because it's a Spyderlovers cliche doesn't mean that it's not true: if what you want is an RT, don't buy an RS with the plan to turn it into an RT.
Meaning, consider your likely riding style: Will you be riding close to home, or spending days out on the open road? If the former, the RS is a great purchase, and easily moddable as you desire. If the latter, I'd save your pennies for the RT.
What's funny is that I *knew* all of this before I bought my RS, and yet I *STILL* spent the past few months upgrading, at considerable expense, all the comfort and distance features to make it more RT-like. In hindsight, I probably should have saved my money and waited to buy the RT, it would have saved me a few modding headaches, but I have no actual regrets going with the RS.
RE: seating position on the RS, all people are different, of course. My arms and back didn't mind the stock position, but that particular lean on the stock seat hurt my hips and knees. With risers, the stock RS position is much improved, and after I install my footboards and pegs, I'm assuming I'll have all the variety in the world for long-distance touring.
Second the recommendation: test drive both. *Sit* on both, for a long time, don't just hop on and off in a showroom. You're spending real money, spend real time evaluating the Spyder.
Good luck!