theres always risk in buying a used car, you never know how the previous owner treated it, usually the fewer owners, the better, id try to buy from someone on this site, usually you can see history of the car through posts, that and we tend to keep our cars better than most

99's have 16" rims 00 and 01 have 18"
00 and 01 have automatic AC controls, 99 does not

i think those are the only differences other than the colors there were available

be on the lookout for fuel econ (some people report getting as low at 12-13mpg where as i get 17-20)
look for broken CD changer
sticking windows

do a search, this question has been asked and answered at least 4 times in the last 6 months