I need your help on buying my X5!

[Hansel]

Ok long story short.. i totalled my 03 350Z in a flood here in the freakish rains in so cal in feb. then i got an 02 boxster S, 4 days later i totalled that (this time it was more my fault, and the bald tires) SOoo, now insurance basically wont let me get another sports car.. for obvious reasons.. so my next car is clearly gonna be an X5 4.4.. which leads me to my questions for you guys..

a freind of mine has a 2000 X5 4.4 loaded w/ nav.. only 32k miles on it.. i can probably get it under 30k

or i've found some 01-02's for a little under 35k.. is it worth it to get the newer 02ish models rather than the 00? is there that big of a difference between those 3 years? i really want navigation and they all have it but i noticed the 00 model navigation is a lot smaller than the 02's..

also sport package? can someone give me a quick rundown? im going to be towing a ski boat with it.. the dealer said it has air suspension but didnt go into much detail.. i test drove one and i LOVED it.. you guys are lucky.. someday soon hopefully i'll be joining you! thanks in advance.