Jake, you were running some old Hoosiers on aftermarket rims, right? Were they the same size as the stock 15x7s or larger diameter/wider? If you stick with 15x7s, your choices are 225/45-15, 225-50/15 or 245/50-15. Of the brands I looked up on the Tire Rack site, only Hoosier makes a 245-50/15.
I used to run the old generation BFG R1s in 245/50-15. They were a little wide for the 7" wide rims, so their response was a bit rubbery, but they offerred better ultimate grip than 225/50-15s. I finally gave up on them when I spun the car around backwards at full lock, and learned that while it's no big deal for the tire to rub the back of the lower A-arm in a tight turn while going forward, it is a big deal with the tire rotating backward -- cut the entire shoulder off the tire, well in the cord.
According to the specs published by Tire Rack, the Hoosiers seem to offer a wider carcass/tread in the 225/50-15 size than Kumho or BFG. Avon is getting out, so while you could get tires cheaper this time, they probably won't be around the next time you're looking.
The other thing to consider is tire life. Hoosiers and Kumho 710s are fast new, but I've read reports in this forum that they lose their grip before they are worn out. I've been running Kumho Victoracers for a long time, and they seem to perform pretty evenly throughout their lives. Of course, if they were ever as fast as new R6s and 710s, I would be king
Check around on the tire life issue, and decide how much you want to spend. You might decide to pick up a relatively inexpensive set of semi-sticky street tires and learn to deal with the understeer... then when you do jump for R-comps you'll know how to get the most of them.
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) I'll track some down for next year probably. I'm interested to hear how they do for you for the rest of the year.