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I would recommend going the purge and fill with R134a route.
I have a 1990 Toyota Cressida as a daily driver, and I went with the R134a as per recommendation from my AC guy.
I too read all the negatives of R134a (versus R12), but I'm pleasantly surprised how well the R134a has held up.
I got 61F (at the vents) on a calibrated thermometer when we first did the job.
(Minimum temp is 65F according to the AC guys.)
Since you gotta crack the system open to check for leaks, you might as well replace all the o-rings (to handle the R134a).
Also, you need to vacuum everything out anyways, so it's a no-brainer to go R134a.
Ask if you can slightly overfill the system with R134a - this is the key to get everything real cold enough.
The stock compressor should be able to handle an extra half pound of R134a no problem.
With all the headaches associated with R12 (i.e. licensing and PRICE), it's nice to be able to run down to the local auto parts shop and pick up a 16oz. can of R134a for $10...
-Ted
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