Hope this helps ... bear in mind there are many many brands of each.
Premium Vodkas -
Absolut
Smirnoff (sort of)
Grey Goose
Kettle One
Premium Gin -
Tanqueray
Beefeater
Bombay
Premium Rum -
Captain Morgan's Private Stock (spiced)
Captain Morgan's Parrot Bay (coconut)
Malibu (coconut)
Bacardi (plain, limon, and spiced)
Premium Tequila -
Jose Cuervo Gold
Jose Cuervo 1800
Premium Scotch -
Glenlivet
Johnny Walker
and a number of single barrel brands by small breweries
Premium Whiskey -
Jack Daniels (black label)
Gentleman Jack
Jim Beam
As far as Bar or well brands you could look toward companies such as Barton's
or Bellows for any of the liquours.
In order to research your assignment further I would suggest going to a
liqour store and just compare price.