Vince, with the pre-installed cables, getting a long rudder servo arm would be a bad thing, and you definitely do NOT need more elevator travel. I'm flying with 15 degrees right now, and it's too much for sequence work. They are just huge, so need less throw.

JR standard "X" arms, that have two lengths on them is what I used... cutoff the short arm parts, and you're good for all the surfaces.

The rudder is ALSO VERY, VERY effective, and you don't want large throws for it, either!