From my experience Fall is a great time to sell bikes. January and Febuary I sell parts and frames. Spring is a season that just doesn't happen anymore in the midwest. Trying to sell a bike in April or May when its raining and 40 degrees....not ideal.

Campy sells. The big 3, Raleigh, Motobecane and Peugeot are the easiest bikes to sell. A white and black Peugeot wether its a UO-8 or PX-10 ...sells.

Moto Grand Record or Jubilee...money in the bank. Brooks or Ideale saddles...gold.

The Japanese stuff I really dont know that well, but SunTour Superbe and Cyclone are big. Same with barend shifters.

Read thru BF and see what everyone raves about and buy bikes that have those parts.