Then again...
If you have a large enough body of work with a consistancy in your way of seeing, it can contain many portfolios. It's just a matter of seeing the bigger themes within your work, then recognising the more intimate themes within the bigger ones. An example would be if you photograph nature, doing a winter portfolio, or the seasons, or the transition zones where different environments meet, or nature taking back derelict manmade structures, or...
Once you pick a theme, the story becomes more important than any one image. You may find that your most-popular-sure-fire-slam-dunk-seller of an image just doesn't fit the flow of the story line, and that an image neglected for decades in your reject file is the only one that provides a vital pivot point between "movements". If you check your ego at the door and work hard on the sequencing of the portfolios images, your personal preferences become secondary to the needs of the portfolio...am I making sense?
The hardest part is to finally commit and just print the damn thing after staring at your own images for so long! But then every artist suffers that moment...when one more brush stroke, or blow of the hammer on chisel destroys the piece. Anyways, just some thoughts from the hinterlands...
Murray