Well lets start with who has a room -

AC Hilton
Tropicana
Caesars
Ballys (technically 2 rooms)
Sands
Resorts
Taj Mahal
Showboat
Borgata
Harrahs

For size you are talking Taj. For game selection Taj and Borgata. For tournies - Taj, Borgata, AC Hilton, Caesars, Harrahs. I havent been to Trop in a while - but they were always in the top three as well.

Being at Taj gives you access to Showboat and Resorts. All attached. Same with Ballys (Caesars and Sands). I'm also fond of the daily tournies at AC Hilton (something like $40 with no juice).

Borgata is usually crowded - they will be opening a new room (I dont know when) but until then you'll have a wait for a table.