i bought a 2000 is200 12 months ago and i have needed, new clutch, window regulators, starter motor, foggy headlight, engine issues (leaking gasket) 170,000 ks. i don't think there is much difference at all between them, seen as it seems that the 99 and 2000 both have the same common issues.
despite all that i would spend my lifesavings again to keep her alive just because shes sooo much fun to drive! and chicks love it ;)