Originally posted by reivax Non of those you can get new since they arent in production anymore.
If you also want to replace your kit lens then look at these.
Pentax/Sigma 17-70 mm
Sigma 24-70 f/2.8
Tamron 28-75 f/2.8
(i did those 2 last numbers out of my head so i hope they are correct)
If you want a "pure" portrait zoom then
Pentax 50-135 f/2.8 is super for that
Sigma 50-150 f/2.8 is another option.
You have the focal lengths that are mostly use that way, although some like to use wider lenses though since the images look more personal then.
I've the DA*50-135 myself but I also use the DA*16-50, DA40, DFA100 and Sigma 30 for portraits, it all depends on what kind of look and feel you want.
ps. maybe the DA18-135 or sigma 18-125 might do the trick as well, never seriously looked into those lenses myself though...