Be sure to check out
www.turboford.org . You should find a buncha XRs in the classifieds, all to fit your budget

Always wanted to get my hands on one, but decided to go for a motorcycle instead. As I've been advised, get a parts car and be sure you like to do your own work! IRS + 2.3T! + RWD would be such a fun project car... Good luck with it!