How to expand this list to 3000 points?

Ok, so as mentioned in this thread, I've recently started a Custodes army after getting two combat forces. Thanks to a great deal on two completely legitimate calladius (Draxus will shoot anyone who says otherwkse). I've currently got plans to build a 'typical' 2000 points combat force list.

ie Draxus, 2 Calladius and the contents of the combat force boxes come to 1995 points.

So I was wondering how I would take it to 3000 points without simply adding another combat force.