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The Dunlop distributor (that supplies Steve at the LRRS events) has some good deals going right now...
I just picked up a set of D209GP (just $22 extra delivered to wherever-home your fav bike shop).
http://dunlopracing.com/special.htm
Steve at Dunlop race is very knowledgeable - tell them what you are planning to use them for and they will help you figure it out...
For track events I would keep away from the entire latest Dunlop race tires, like the Ntec's, even on a purpose track day bike - a lot of hassle.
The Ntec rear runs around 23lbs pressure, HOT (17-19 cold). They really don't work without warmers.. –I have heard without warmers and their stifft walls (to handle such low pressures) don’t allow heat build quick enough before cold tearing starts. In addition re-valving suspension is needed to get the best from the Ntec....but if you’re bike is properly set grip lasts longer...
SO, unless you're turning fast(est) race guys times. go for the now lower price +1 year old design....