Why are you looking at the NT05 for a "dedicated track tire?" They are great, but merely R-compound street/track tires. They (along with Toyo's RA-1...nearly identical tire except for tread-pattern) would be good if you only had one set of wheels to drive on for both the street and track. I would recommend those along with Michelin Pilot Sport Cups.
For a track-tire, the Hoosier R6 is your best bet (and you can still legally drive on the road, although you run the risk of tire-damage). If you want to step it up to actual racing-slicks, then your options are wide open beyond that. I used Goodyear G19 for two seasons until switching to Michelin Pilot Racing Slicks.
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