The question is... what riding level are you at?

The GPR70's you've got warm up very quickly, provide decent feedback, are light and still have decent grip... They were the control tyre in the Asia 250 classes I believe, so good enough to race on...

The BT090's also fall into the above category.

If you want mental grip, then a set of D208/9GP's will turn to snot once up to temp and would be my sticky tyre of choice, although many people on this site get on with Pilot Races, Rennsports etc...

It's really up to you as they are all sticky as feck!
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NSR300R - Why did i ever have a 250...