Really impressed by Justified Image Grid. It's highly configurable so there's a good chance you'll be able to get it to do just what you want it to. Of course, with that amount of flexibility does come a learning curve and Justified Image Grid can be quite daunting. The good news is that the documentation is excellent. I had some problems getting it to work in conjunction with a text widget. Firsh was amazingly helpful and went to great lengths to come up with a solution. So I'd say the support is first class. Highly recommended!