Glad to see your interest in on-road!
There are many high quality kits available. It really depends on if you are going to race or just have fun around your house. Next decision will be 1/8 or 1/10 scale. Finally is support and part availability. If you have a local track, I would talk with those guys to see what they are running. X-Ray is an excellent car. I prefer Shepherd, but then everyone you talk to will tout the car they are running. Check out www.team-shepherdusa.com
excellent support and high quality cars. Good luck!