I would take Row K. The stage at the Atlantic is eye-level, but it's long and wide, so you sometimes don't get to appreciate the full stage picture if you're sitting very close. I was Row E for DAYS OF WINE AND ROSES and found the distance was ideal.
Definitely last row, intimate theater and the only place I wouldn’t want to be is first few rows, might be a bit close/looking up - unless you don’t mind that and really want them to sing in yuo