I'll second spending some good money on a quality tripod/head. I'm going to diverge a bit from the pack, recently bought my first 'real' tripod, and while it's not a bunch of money like the RRS (really want one!), it was still $400+. I got the Benro C-0681
travel tripod. 4 section legs, they fold up around a fully extended center column w/head so it's small enough to fit into a fairly small suitcase. Pretty light, 1.1kg/2.5lb, and feels pretty solid with my 5d3. I've been using it with my Mamiya RB67, which is probably 8-9 lbs with lens and film back, and while it works fine, I have the feeling I'd like a bit of a heavier duty head, possibly with a more solid 3 section tripod. Works fine though, even if it's closer than I'd like to the max rated weight of the head and tripod (6kg/13.1 lbs).