Got my A/C done yesterday as well, mechanic went ahead and converted it to 134a said it didn't take anything, plus the 134a will be cheaper in the future. Love that A/C.
I'm having my a/c compressor replaced today, there are few things I really need in my dd but a/c is definitely one of them. My mechanic gave me the option between R-12 and converting to 134. I opted to go with the old R-12.