This is a question asked on almost every thread, and you will get as many opinions! Some fly her bone stock and apparently successfully, but I personally like the reassurance of a plane that is going to achieve speeds over 100mph of being as safe as reasonably possible. As such I use these on all control surfaces :
http://www3.towerhobbies.com/cgi-bin...0&I=LXGWD8&P=K / another option:
http://www3.towerhobbies.com/cgi-bin...0&I=LXEMF9&P=K.
I use only ball joints for all connections:
http://www3.towerhobbies.com/cgi-bin...0&I=LXCJRY&P=K
I always replace my Ca hinges on all planes with these:
http://www3.towerhobbies.com/cgi-bin...0&I=LXET55&P=K. I have had Ca hinge failures (not pulling out but splitting). Potentially not very pretty at speed especially on an elevator. So this is all optional, but your Saito will get her moving very nicely and depending on your flying style, I would certainly consider taking the time to do these mods. NB lightly glass the motor mount.
I used twin rear mounted elevators -- this is a pain to do, but needed with the heavier DLE. They do provide a very slop free linkage however. I used a carbon tube for the rudder -- light and very stiff. If using the 2/56 elevator pushrods they need some stiffening from the guide tube to the servo end -- again some carbon rod is good -- not vital, but makes for a nicer plane if doing knife edge etc. Otherwise she is good to go.