have you tried mexicocina yet? they're in longwood on 149th, i believe right by tinton. a short walk from the e 149 6 stop or the jackson stop.simple menu, great prices, great food. the owner is a super nice guy. we just tried it for the first time within the last month (he's been there less than a year) and have been back numerous times!
On a side note, Welcome to Melrose has a glowing review of Coqui Mexicano, which is right near the old Bronx Courthouse on Brook Avenue at 161st Street. Thanks for the tip, Eddie!