help with purchase - 56 - 57

After lusting after these last years of Hornets for years I have decided to make the plunge and get a 1957. Can anyone give me some advice? What are the plusses and minuses of 56 vs 57 ? Is the 327 Hydramatic combo reliable? How are the cars as far as reliability and driveability? Any trouble areas? Any and all suggestions helpful - I can't imagine I'll see another drive by me if I can find a nice one. they are a rare sight.