This forum does stay pretty dead. As far as what call is the best is the one you can make sound like a duck. I would suggest not buying one from an online order for the fact that you cannot try it out and hear what it sounds like. With that being said, even the same call from different production years can be different depending on the person who tuned the call before it made the trip to you. With you being in AZ, the ducks have heard about everything there is to offer by time they reach you. I know, I hunted in SE AZ area for a couple of seasons.
Now with that said, I personally have an RNT Original and RNT Alpha 2 as my work horse calls depending on what the birds want to hear on that particular day. I love these calls and with a little tuning of the reeds for my personal style of calling I can get them to coax some pretty pressured birds to take a look.
Hope this helps. Remember, if at all possible, try before you buy.
"Sticks and Stones may break my bones, but political correctness is killing me."