I'm using the 250gp slicks. I use tire warmers and if you run them hard it's not a problem keeping heat in them. I'd love to run the N-Techs but they don't make them in the 155 or 165. It's not just power that keeps them hot or gets them hot. Braking, accelerating and good corner speed will keep tons of heat in the Dunlop slicks. They are just great tires.
G
PS: The GSXR400 is in getting the carbs set up and then I hope to have it on the track monday.