Sounds to me like you've answered your own question. Buy it and fugggetttt about it. We all have to replace tires. To be expected with a high performance car with sticky tires. But to not buy one because it MIGHT have a catastrophic engine failure is foolish. Sure, it possibly could blow up. But so could any car you buy, whether it be a corvette, bmw, audi, whatever. Overcome your fear and live, grasshopper.
Oh.. and there are lots of tires significantly less expensive than 300 per. wayyyyy less expensive than 300 per, and which are better, in almost all aspects, than the perelli's you've currently got on it. But that's a whole nuther discussion, which has been beaten to death. Check the archives here and elsewhere.
Just buy the damm thing, take some pictures of it and post them here. You won't regret it. Or sell it to me for the 11K. My son is wanting one too and at that price i'd come and get it and drive it home. AFTER a PPI!!!
Bob