You should look into the Hangar 9 Titanium pro-links for pushrods. I'm using them on my new plane and they are great. They allow for length adjustments that you can't get with anything else (unless you make your own, and put left-hand threads on one end).

As for the control horns, I have used dowels before, but recently started just using a ply plate recessed into both sides of the surface. Easier to do and shouldn't sacrifice strength (I haven't finished the plane yet so I can't say for sure, but I really don't think it will fail).

Ben