Personally, I have not had very good luck with reman compressors, tho I have had better luck with the A6 than with the R4. After replacing the one on my 'Burban 3 times with a reman, I finally bit the bullet and bought a new one.
That being said....if you can find a place to rebuild yours, I would go that route, but make sure you check their track record. Also, if you do have yours rebuilt, make sure you demand that they do NOT remove/damage the original decals on the housing...that's what make the compressor original to the car.
I need to rebuild the compressor on my '74. My intention is to buy a reman, the swap all of the guts into my original housing...at least that's the plan.
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Joel Adams
C3VR Lifetime Member #56
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"