However, I thought CC2 plans always looked simplistic somehow (in contrast to their production) I can't really explain what I mean - sort of pencil-and-paperish? and my brief look at Autorealm suggested a similar style.
Autorealm sketches do look similar to CC2's. I think what you mean is they won't have the "painted" look you will get from Dungenforge. If that's what you want, then don't use Autorealm.
I like the Autorealm and CC2 look because it does look like a pencil sketch. You can add color and detail, but you still have the feel of the old CT sketches that won't use an ink cartridge per page if you want them printed on paper.