Oh, I can agree on Eric Bana! I've been a fan since Black Hawk Down.
I love Terry O'Quinn, but he's too iconic... I think maybe more unknowns work best for this show.
I couldn't think of any actresses... so I googled "best actresses in their 30's" Ugh. Almost the entire results on the first page were for the "sexiest" or "hottest" ones. I said BEST. Annoying.