well, assuming im right about your intended use, you are gonna want somthing that can handle power without issue since you will be 2wd. you dont want to skimp here. its unfortunate you cant find them used. if you are gonna be doing the work yourself, a well set up clutch diff cant be beat.
4-Time NNJR ESP Season Champion -15 ESP
3rd Place in 09' Pax Championship/Driver of the Year
2012 Northeast Divisional Champion in ESP