[micholix]

I'd go with big bore springs, also on the small bore shocks, so u can switch springs between your small bore and big bore shocks.
If i remember correctly, schumacher uses big bore springs on small bore shocks for quit a longer time with great success, so you cant go wrong with that!

Edit: Stay with the SB shocks, what i've seen, Jorn Neumann and Michal Orlowsky prefere small bore shock on indoor carpet tracks, i think its because of shock pack!?