97 Grand Prix GTP AC Problem

1997 Pontiac Grand Prix GTP Sedan 4-Door 3.8L 3800CC 231Cu. In. V6 GAS OHV Supercharged that started misting out the vents with the AC on max, we had been driving about 4 hours on a very hot day. The mist lasted about 10-15 seconds then started blowing neutral air, no greasy or antifreeze type smell. Is this indicative of the compressor or am I out of freon? I took it to a shop and they quoted me over $1300!!! saying the compressor is bad, although it's turning on it's not circulating. I found a compressor repair kit online that includes: One Remanufactured Compressor: 10-987 One New Drier: 60-33214 New Orifice Tube: 90-38623 One New Seal Kit: MT2540 8oz Can PAG150 Oil.....for $150. I'm sure I can find someone to install it if the compressor is really the problem. I know it will need to be vacuumed etc so I can't do it myself. Advice?? This is the link to the repair kit I found on eBay: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130503307226#ht_3789wt_1010 I don't want to buy junk parts but this seems reasonable vs the $450 the garage quoted me, not to include the other stuff or labor.