Translation table with sample rooms (I may be off on a couple of these, so apologies in advance to TS):
Standard Regular ($59 USD) = Paz / Amor
Standard Large ($69 USD) = Esperanza (Courtyard wing) / Pura Vida (Clubhouse wing)
Standar Deluxe ($89 USD) = Hermosa / Vista del Sol
Junior Suite ($99 USD) = El Rey / Amante / Las Palmas
Master Suite ($109 USD) = Presidente Suite
Mansion Deluxe NEW! ($119 USD) = Leopardo / Zorro
Mansion Suite NEW! ($129 USD) = Mono / Toro Negro
Mansion Master Suite NEW! ($149 USD) = Leon
Mansion Double Bed SuiteNEW! ($159 USD) = Oso Grande
Penthouse Suite ($250 USD) = The PH suite in Modern win.g, 2 BR/party room/2 jacuzzis
In my opinion, the value / comfort sweet spot = Modern Wing Jr. Suites.
I also like the Presidente Suite - I think it's the best value in the house. Another great value - clubhouse rooms since they've been remodeled recently.
In reality you can't go wrong at the SL with any room. Even the rooms right off the bar area are fine unless you're an light sleeper or planning on sleeping during the busy evening/night. My first time ever at the SL was in Paz, which is the smallest room and in the highest traffic location... and I was happy as one can be.

If noise bothers you, or if you are the type who doesn't want everyone to see who's going into / out of your room, then I suggest Modern/Mansion or Clubhouse wings.
CRT discount of 10% applies but there's a special right now; if you stay at least 4 nights I believe the discount goes to 20%.
mh