don't worry about the milage mate, mines has 150+ thousand miles on it and i supercharged it and i was fine., the only thing i would recommend is keep an eye on the coil packs but to be fair with engines with this higher mileage they are probably due to go anytime soon anyway.
Don't sell it mate bneen down that road, Trust there is nothing else out there that is as good.
Everything i look at from Civic Type R's to Skyliners, to Evo 9's to Supras have some missing which the IS200 has be it praticallity, style of just comfort.
Trust me mate don't do it.