I think you are headed in the right direction. Wheels/tires are one of the best modifications you can do for your car in a performance perspective. However, the best spent money IMO, is seat time. I would buy some performance based tires(listed above) for your stock wheels and spend the extra money on seat time. They will last you all season and then some for track and street driving. I would also set aside a extra few hundred dollars just in case you do crack a wheel, but I think you will be just fine for now.
For track wheels, I just picked up a set of CCW 18x10's with what is prob. a +50offset. I do have coilovers but according to John at CCW, you can run the CCW 18x10 or 17x10 with 285's in the front without fender rolling or suspension modifications. I have ran several different wheels on the track ranging from stock size to 18x10. As far as the wheels you are looking at in question: What size rim and offset? What size tire are you looking at running?
For a long.... LONG time I really had a problem spending money on wheels. I pieced together a set of 18x8.5 Gram Lights 57c(bronze) for the front and a set of of Enkei RP01(silver) 18x9.5 in the rear because it was some what of a similiar wheel(both 5 spokes, right?
). I painted them black so they would stick out as little as possible and because the brake dust would blend in more. They worked very well and I still keep them in the trailer as my back up wheels. I had less than $400 in the set.