Broadway Bound-pre fixe or drinks??
Just my opinion but I think you'd be better of eating something before the show and saving the drinking for after. Here are three of my favorite casual dining spots:
Trattoria Trecolori - Italian - http://www.trattoriatrecolori.com
Marseille - French/Mediterranean - http://www.marseillenyc.com
West Bank Cafe - Contemporary American - http://www.westbankcafe.com