I would suggest getting the most practice time on the tire that you're going to race on (if you can afford it).
I use Toyo RR's and drive them on the street to/from events. I have bought them from retail stores, TireRack, and other online stores without any problem. Not sure what's going on up in NorCal!
I have also driven Toyo RR's in the rain several times on the way to/from the track and its not as bad as everyone makes it sound. Sure you have to slow down and it helps if you can follow the tracks of the car in front of you. But its not like you'll automatically die. If you know how to drive, you will be fine (just go slow enough not to hydroplane).
The RA1 should be shaved before use on the track otherwise they will squirm around like crazy for a few sessions.
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