Wilwood makes some good kits.
However, I can't seem to find the kit you are describing. Are you referring to:
http://fastbrakes.com/shop/product_info.php?cPath=28_249&products_id=1007
???
I ask because there are few track compound pads available for Wilwoods 6 piston Superlites (at least the last time I checked). Which makes the 4 pisto calipers (Superlites, Dynalites, Dynapros) better choices for a track car.
Stoptech makes some great quality brake components as well... although be aware that there have been cases of interference between the rotor and balljoint at steering lock with their kits. People have had to run a 5mm spacer
behind the rotor to get around this.
Anyway... The best compromise between street in track is none of the above. You will need to run street specific pads on the street, and track compounds on the track... at least, if you want to get the most out of your brakes.
Have you considered simply upgrading to a more aggressive pad, some high temp fluid (Super Blue, Motul RBF600, etc), and some stainless steel lines? This will transform your stock brakes as it is... the only real reason to jump to a big brake kit is for improved heat dissipation during long track sessions (i know you mentioned that this would be for a track car, but Im just saying...)