It really depends on what you’re looking for. You ask for Modern or Yeshivish – does that mean you want a right-wing MO yeshiva?
RTMA is a good school, if you’re looking for somewhere that will give your child a firm foundation in Judaism, but not a kollel lifestyle. Pretty much all students there go to Israel for a year or two after graduating, and then go to college. They do get a love of learning, and many learn daf yomi, or have a chavrusah every evening.