Thx for the replies, Tor
I'm a bit hesitant to take a greater daemon for the moment

. Too many risks: okkam or shadow powered units, shooting,steadfast,...
Taking one also shrinks my army. I'm going to take one in some of my future tournaments though, but for now, I'll have to do with things I have painted.
I'm leaning towards taking a unit of 10 flesh hounds to add support to the letters or hunt some small-medium stuff. Or to put on a side with flamers, to back off potential threats.
Or should I just take another unit of 30 bloodletters, or is that just too boring?
Greetz, Bjorn.