I do like the Freedom-Class, something about the single nacelle just appeals to me (maybe for another story).
For what I'm thinking about at present, I'm looking for something that would have a crew of around 15, at most 4 decks and under 100m in length, something that the wars with the Cardassians and Tzenkethi brought about (a little ship that's hard to spot for carrying out remote reconaissance during wartime but could also be put to use scouting ahead of exploratory missions when things quieten down).
The Raven does pretty much tick all the boxes, but I was looking for something a little more Starfleet in it's appearance.  I may just have to think up something, but if there were options already out there I thought I'd have a look at them first.
Hope that helps clarify things.