Don't even get me started on THAT horrible excuse for a format!!! I had to rebuild a DVD from the original source material that was cut on Adobe Premiere and the translation from AVI to MOV was a nightmare.
Be aware of luminance and/or color shifts, especially if you convert to MOV on your mac.
Best advice I can give is get the conversion done from AVI to MOV on a PC. The best quality I got was from getting my hands on Adobe Premiere (on PC) and exporting the AVI to quicktime, then moving it across my network to the MAC.
Andy