2000 has a rear LSD. The 2000 and 2001 are exactly the same, besides a carbon fibre "look" interior option on the 2001. I think the '99s and '00/'01s are the same except for the MAF which you already mentioned.
Don't forget that sedans started in 2000. I personally think the 01 CF interior is tacky, so '00 gets my nod. Keep in mind there was no red for '99 and blue changed to BRP in '00. '99s get the five spoke rims and 00s get the six spokes.