here guy. this is the sexiest lookign kit for the sentra (or 200sx [which is the 2dr sentra if you havent figured it out yet])
its the erebuni gtr and you can get it here->
http://moldynamics.com/
or on erebunis website which slips me at the moment
pics curtesy of npm
link to more pics and article:
http://www.nissanperformancemag.com/june99/matt.shtml
nissanforums mike roberts is also producing a carbon fiber lip kit that is going to be very sexy so you may want to wait a couple months and see if thats a better style. otherwise, the only sideskirts that are going to fit your 4dr are the extreme skirts, i personally dont care too much for the extreme kit, but you may like it. theres also r34, omega, drift and a couple other kits available for your car. the bumpers are always gonna fit but you gotta make sure you dont get a complete kit designed for a 2dr or you'll have problems with the skirts for sure.