Before you spend all that money you may want to look at this.

This is what I use on all my warbirds and 3D planes and I have never had a problem yet.

It has an adjustment pot on it so you can zero the control surfaces out and it also allows you to just plug and play..and for under $10.00 you can't beat it. Dont mess with adjusting one servo as some one at your work suggested. Just get this and be done.
Expert Brand and the model number is exra325


http://www.e-clec-tech.com/seres.html

This link shows thew price as $19.99, but my local hobby store sells it for about $9.00.

Good luck.

Tom