First - THE VIPER IS NO LONGER BEING PRODUCED AND THERE ARE NO PLANS TO MAKE MORE.
2nd, the Asp is a really great board and with yours skills you'll really love it. I have two of them, with a 9XR Pro, set up by Kevin with the extra three-position switch, and this is how it looks in action. Two tanks, both on the Asp, with model matching.
https://www.youtube.com/watch?v=IfebpdFNgQc