You can't go wrong with the Stratosphere's NL $1/2 ($200 max), which often has beginners. Bally's is pretty good at most times of the day. The Excalibur's NL $1/2 ($200 max) also is pretty decent.

I'm not a fan of the Luxor's $50 max format for NL (blinds $1/2) because it's not enough chips to play with. Same goes for the Imperial Palace's $1/2 $100 max.

$200 max for $1/2 feels about right. Even the Excalibur's $200 max for its $1/3 game is fine.