The best advice I can give you would be this; Snipe the early issues in auctions that are hinged. Hinged stamps are not as heavily watched or bidded on. It has worked for me in adding the more expensive early issues, and really helps to limit how much money you dish out filling your wish list.

When I mean by snipping is this, Locate a stamp you would like to add to your collection, Watch the bidding until the last 60 seconds, enter a dollar amount just a few dollars over the current high bid, as soon as the clock hits 3 seconds until over, click and submit your bid. More of the same will continue to come around so don't get disappointed if you don't win right away. I don't use any snipping software for this, it takes the fun out of it for me. I only use the quickness of my finger and the money I can live without; I should say my wife can stand to live without

I have grabbed a lot of really nice stamps with this model.