[TedRamAirII]

r12 is the best and its not hard to get. OEM last installed it in 1993-94? its still around, as r134 will be here for a long time. The new r1234yf is $700 for 10 lbs. For now the wrecked cars in body shops (your insurance company) is paying for it and rates will go up to cover it.
Be sure to use new hoses, as they are much better at sealing the system. Do not install the accumulator until you are ready to put the system under a vacuum. If they use a Micron Gauge, it should be easy to tell if there is any leak. Sometimes the compressor shaft seal can leak under a vacuum, but will seal under pressure. I would for sure get someone that knows what they are doing, it's easy to get air mixed in with the refigerent if little cans are used. Be sure to try to get all air flow to be pulled through the condenser, seal off any gaps so there is no air leakage between the condenser and the radiator. Be sure your clutch fan is good and operational.