Do you really think an X100 is the best choice for a relatively new flier as a 1st 3d plane? I would for sure start with a smaller , less expensive plane that could use std servos and a smaller engine. Most of the x100 guys on that thread say a Saito 1.25 isn't enough engine for one and are going to YS engines. I guess you could fly it with a big 2 stroke but why get a big plane and not use a 4 stroke for 3d?
I picture a guy that has a couple of years with trainers and sticks wanting to get into 3d. But we don't know that and he may be a pattern champ or something. A friend wrecked his trainer, then wrecked a Slowpoke,all in a few flights each. Then after watching us fly 3d went to his favorite hobby shop and brought home an X50. He finally got his Saito that he bent up back from the shop and will have it going soon. I will learn how user friendly the X50 is for learning fliers. I am not optimistic. He is another guy that has to have pretty planes right now and so far its cost him $$$. If you have lots of money for RC stuff get whatever looks good, bigger is better, you get what you pay for, etc and have fun.
Note that WHYNOT (a few posts above) doesn't even think the X100 is much of a 3d plane.