I would definately track-day the RC, see if you like it, just be careful ride in your 80% limit cause it is expensive to crash. And sucks to crash a street bike. It is completely different to ride than a 600 but all it can do is raise your ability when you ride it on the street.
If your going to race it I would probably get a 600 to learn on cause they are a little more nimble and easier to learn on.
I race my RC competitively now but did 6 years on 4 different 600's and it helped me appreciate running a big heavy twin
now racing is just fun as the bike is a hoot to ride fast