For the record some other cars that have similar wheel sizes/fitments to look into are Lexus IS250 and 300 if you don't mind going to 17s... which I'd consider so you can fit larger brakes potentially, and just the fact that 16s are going the way of the 15s... selection will only get smaller since newer cars are coming with larger and larger wheels overall.
A cheap OEM solution might be Nissan 300ZX Z32 wheels... the twin turbo cars had 16x7.5 up front with +45 offset and rears had 16x8.5 rear with +35 offset(this one I'm not sure is how doable with our cars... that's for the fitment experts to say).
Not turbo cars had the 16x7.5 all around.
They have a 66mm hub bore, ours is 67.1mm... so taking the wheels to a machine shop for a VERY simple operation should be no problem to have done under $150. Since the lugs are 12x1.25 acorn type seating, you could honestly use a die grinder and open up the wheel hub enough to smoothly slide the wheel on, though I'm not as apt to recommend it for track use. I've done it plenty of times as others have on offroad vehicles, some of them taking more abuse than any track car will ever see(short of crashing:cheesy

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