Alcohol for my wedding.?

Does anyone have any good ideas or suggestions for alcohol at a wedding? I am only going to be serving beer, wine and margaritas. For the beer I am going to be purchasing Kegs. But my question is how many Kegs should I get for about 140 people? and how much wine should I buy? does anyone know of any good wine to buy? All your information is greatly appreciated! Thanks in advance for your answers! :)