The other unit I finished at the weekend, was a second squad of tactical marines for my Ultramarines. As with my Sons of Horus, I am trying to get the bulk of the basic troops done first, before I start looking at the more interesting stuff, simply because I have a strong belief that basic infantry is where motivation goes to die. If you can get through the basic ranks, the project is a good one, if you can't, walk away.
Also, the other thing I want to try with my Ultramarines is smaller more flexible squads, maybe mounted in rhinos, rather than the big infantry squads I favour with my Sons of Horus just to try and make sure my armies play differently.
Thanks for reading