Hi Ludo,
Either 250 of 300 are ok, but they race together, so on a 300 you will be faster! Points are scored separately, but still you want to win the race across the line, not win on points but finish 10th over the line.
There are more races you can do per year: club racing, eg St George, Preston, Hartwell. Also Australian Superbikes (ASBK) have a production 250/300 class.
I'm not sure the exact rules, but you can't change many things on the bikes in the 250/300 clas (this keeps the costs down). It's normally about A$500 per weekend for race entry fees.
Good to have you here!
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