Most of my friends who end up getting a second dog from my breeder go for the opposite gender. Well, pretty much everyone! Since you are flexible about the gender that might be the way to go! I knew I wanted two boys (and maybe a third some day!) and the breeder had no problem letting me have two because A) he was my third dog from him and π he knew I could handle it.
I can't wait to see pictures when you get that new baby!