Hi,
If you look for professional features,
I would recommend
-PhotoShelter (it has a powerfull searching-classification engine, to me the most Pro-featured )
-Clickbooks
-Big Folio
-NeonSky (also very serious)
Then, if you have notions of Html/CSS,
there are 2 good CMS
-Indexhibit (generaly very appreciated by arquitects and designers)
-Pixelpost (very stable and configurable).
Fred.