hi and welcome to loc. theres a few threads on here if ya do searches but something to look for generally is the ecssesive tyre wear on the front tyres. its something to do with lexus geometry settings which wera the tyres rapidly!
ive had my 99' se for 2 years now and not had any major reliability probs just general wear and tear things.
make sure ya get one with a good s/h and ya should be fine!
there's a guy called jamie on here that was in the same postition last year and done loads of posts and threads on buying an IS200 - maybe useful to ya.
personally i'd go for a sport if i had the choice again!!