Going to see a play tonight in the Flatiron district with a friend. Wanted to see if there were any Chowhound recommendations for dinner in the nabe - preferably with main dishes below $20. The play is on 21st between 6th & 7th, so something in that particular zone would be great. Open to any and all forms of cuisine - but something slightly upscale in mood would be ideal, since my friend hasn't been out for a girl's night in a while. Suggestions?