A brad nailer can make finishing trim work go a lot quicker, and though pneumatic versions are available, the electric models always seem to be easier to deal with, IMHO. These are also sweet for craft work as well.
The model pictured above fires 5/8″ to 1-1/4″ 18-gauge brads, and offers power adjustment via a dial. It’s got a slide-load magazine and a soft grip handle.
There are lots of models available, but I used this one recently when I visited a friend working in a frame shop, and it seemed quite solid. Street pricing starts around $60.