Kuhmo's are a great tire. The Victoracers were originally a road race tire then autox'ers found they worked pretty well. The new V700's are currently using the same compound as the Victoracers (all sizes will be converted to a new compound come October). I have a feeling the new compound will be much softer to try and compete with the Hoosier autoX tires.
Anyway here are my opinions on options for someone who is doing track events:
Kumho Victoracer V700's (Great tire, may not last all that long)
Yokahoma A032R's (long lasting tire, not as sticky as the Kumho's)
Hoosier R3S03 (I haven't met anyone who runs this tire for road racing, but as far as autox goes, hoosiers are the top tire. Make sure you get the R for road race and not the A's or you'll eat the tires alive. The A's are for autoxing.)
I don't know anything about the Toyo's. As far as the size goes it is up to you. If you want shorter gears go with the 205's. If you want more traction with approximately the same gearing go with some 225's. A bigger sidewall on race tires is typically better to a point. It allows you more flexibility on adjustment. Basically the pressure effects the tire when it has more sidewall so you will have more flexibility on setting your car up.
