I bought my RT Limited from Woods Cycle Country in New Braunfels from Jake. (Woods Cycle Country is a family owned business that is not affiliated with the Woods dealership in Austin) Jake treated me fairly and I have no complaints. I had my 600 mile service done there too with no problems. Their 600 mile service was more expensive than what a lot of others on the forums have been posting for the same service, but I think the dealership is making sure all of the service is performed instead of just changing the oil.
When I was shopping for the RT, I emailed Woods Cycle Country, South Texas Suzuki, Kent, and one in Austin, but only Woods Cycle Country responded back.
I hear South Texas Suzuki is good too, but their place is pretty small. It looked like they had 2 mechanics on staff and only one of them did spyders. They had one RT and an RSS on the floor to look at. They would probably treat you right, but I don't know. I did pay them a visit and the staff was very friendly. When I visited them, I wasn't ready to commit to a purchase yet, but I kept them in mind until they didn't respond to my email. I was really hoping to deal with them because they are the closest dealer to my house, but it didn't work out that way.
I considered Kent, but I changed my mind after their salesman tried to "bs" me during the sale negotiation. He was friendly and appeared helpful, but I didn't like some of the information that I was getting back from him. I called their service department to ask a question when I was still shopping for my RT and the service tech told me he was too busy to answer my question and would have to call me back. I gave him my number, but he never returned my call. Between the service tech and the salesman, I was about to cross them off my shopping list. When I was at Woods Cycle Country looking at the RT, I ran into a Gold Wing owner that bought his previous 3 bikes from Kent and from whoever owned the store prior to Kent. He said Kent isn't as good now that it is under new ownership, so he traded his Gold Wing in for an RT at Woods Cycle Country while I was there instead of buying it from Kent. After talking to the Gold Wing owner, now an RT owner, I crossed Kent off my list of potential dealers.
I don't know anything about the other dealers in Austin or elsewhere. Good Luck with your purchase.