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It sounds like you have it under control but you guys keep in mind "you get what you pay for" I know money is tight for everybody but if you buy a cheap china "new" compressor for $150 and it only lasts 1-2 years when you could have got 1 that was reman'd here in the U.S. for $300 and it lasts 5-10 years??? I guess everyone just has to do their own math. I've installed both along with new and reman starters and alternators and if you take any of them apart after they fail you see a HUGE difference in quality. Allot of reman's only needed their wear items replaced so they still have the OEM important parts in them.Another thing to keep in mind a shop has big overhead they have to cover. In this case they wanted what? $600? You bought the parts for $280? Your knocking them for "putting $320 in their pocket"? Keep in mind they're not doing this stuff for fun. It's how they keep the shop up and running and food on their family table.
If you don't want to pay the cost of a normal repair then you should stay away from licensed repair facilities. If your needs are simply to save as much money as possible, throw a used compressor in there for $50 bucks and the whole job shouldn't cost you more than $100 bucks.