Usually skip Mouse - it's a good OO kit in its own right, but it doesn't play well with Moose. (You can't for example consume a Mouse role in a Moose class, or vice versa.)

Rather than Mo, consider Class::Tiny. It has fewer features, but is less crazy. Sadly, it disobeys the naming rule of starting with "Moose" and then stripping away letters. There are ongoing efforts to get it to play nice with Moo and Moose, and they seem to be getting somewhere.