Domi's are a great place to start. They are not the end all be all, but you can get a new character in them and contributing quickly. As long as they can tank themselves, even just some t1 drones add to the DPS. You can scale up to more DPS with more skills, and can add guns later. They would be my choice if i was building a 6 man team from scratch for level 4's.

It's pretty easy to setup a dual rep domi, and its hard to beat for ease of use. 2x repper, 3-4 hards, a DC, and then cap mods/rigs to suit. Any free slots can go to drone tracking modules.