If you're willing to go to a templated site, I recommend artweb.com now. I've moved my site there and have been moving quite a few artists there whose site I used to design from scratch.
Satisfaction - 5
Help - 5
Easy to use - 5
Value for money - 4
Features - 3. Limited templates but pretty much all you need for an art portfolio, and there are a few advanced features I'd like but since I know how to do html I can make it do something things myself.
MrSite is extremely basic, so I'm not surprised it's not on the list. My feedback on some of the top recommendations...
Squarespace is goreous! If they had a template that suited me I would have used them. I did play with it for a while.
Wix is very flash based and I'm not keen on it. You do have to 'start over' with things that don't work. I do use it on Facebook.
1&1 - I've heard nothing but awful reviews of their billing, customer service and servers! Awful. And from too many people. I wouldn't touch it with a bargepole.
Moonfruit - nice but blog/Wordpress looking. I personally don't like that. It's a nice maker though, very easily learned. Test that it works on iPads/iPhones first though! I'm not sure if it's still all flash based.
I think with anything you try, definitely test that they have mobile/device compatibility now. (both lack of Flash, and that the template adjusts for a mobile device). Mobile and tablet browsing and shopping is increasing significantly!