I started with 98, then 2000 and now have 2002. The decision to purchase depends on what your "uses" will be.
I noticed that the characteristics between say 737 2000 and 737 2002 were different. (but I don't know which one is more realistic.) I will ask a friend who is a pro pilot, who I guess will be able to answer ur question. I will reply as soon as I have an answer. (should be next 24hrs) so look out for reply.
I use FS for entertainment purposes, if this is your goal, then upgrade to 2002. I can't comment on whether either version is good for education purposes, but will try to help.
Best
Mike