Which Photo Hoster?
What features are you looking for? Without knowing what you want the service to do for you, I'm not sure anyone can suggest anything.
I personally have used flickr, deviantart, photobucket, and facebook. Right now, I just use facebook because of the exposure and networking. I created a page for my photography, i upload work a few times a week, I've got everything separated into albums, and it gives me decent exposure to all sorts of people. All I have to do is say "hey check out my facebook page here's a link", they like the page, and now they get all of my posts in there news feed.