looking to buy a z3

hey, i just had a quick question: i've been saving for a while for a newer car than my 92 240sx and i still want a fun rwd sports car. i'm 24 and i'll be starting a new job soon and i want a BMW Z3. my question is, what is the breakdown of the different models of the car? is there a website that can show my the different engine options. i've seen 1.9's, 2.5's and 2.8's. i think i'll be looking at the 2.5 (is that the 192hp?). any help would be really appreciated, i've more than enough time in school to move into an adult car and i think i've found the one here.

Theres also 3.0's and ofoucrse the M coupe.

Heres a little info on the Z3
http://www.bmwworld.com/models/z3.htm