I think the sx you have is the perfect beginner bike, enough power to get out of trouble if needed, easy to ride, decent suspension for comfort, not too quick for a beginner. On a side note, how long did you have to place reservations to get into pismo, I went last weekend and couldn't even park there with a day pass, it was really really really crowded.
own:
1986 250R- ported polished, carb mods, Esr atc-5 pipe and silencer
1986 250R- mild porting, carb mods (Clean!)
1985 350X- all stock (super clean!!)
1985 350x- desert project in the works
1986 250sx- Mostly stock
1985 200x- (pretty clean mostly stock)
1985 Yamaha tri zinger 60