Get the heaviest buffer that fits. You won't notice the slow-down that much to tell a difference. Most of the time you'll be trying to get back your aim for a followup shot to worry about squeezing the trigger again.
P.S. helps to know if your rifle is CAR or A2 length
The place in Casa Grande was Feli's. Pretty good, mid-high prices. ($15-$18 entrees)
There's a great Cuban place in Chandler - Mimita's Cuban Cafe @ Warner & Arizona Ave. Try their garlic fish..... mmmm
Another one in Tempe/Scottsdale area... more Puerto Rican than Cuban tho. Don't remember the name.
Jim,
If there's a sportsman's warehouse close to you (I think they have 3 or 4 in AK), they seem to have AA1680 in stock when I last checked a couple days ago. Buy some online and have it ship to store. Screw those horrible shipping charges. :D