Stonedeaf,

An 11X5 will do just fine. You already have an 11.5X4 which will be very simular to the 11X5. It is somewhat hard to suggest just one prop as the airframe, engine, engine tuning, the way you fly will all play a factor.

As far as CG goes, get everything setup on the plane except for the battery and leave it unplugged from the receiver for now and put the battery in the location but do not tie it down in any way as shown by the manual, put the wing on and check balance. If it shows tail heavy then move the battery towards the front of the plane to where ever it will fit and recheck balance. If it shows allot of nose heavy then move the battery back until you get the plane level of only slightly nose heavy.

On the other thread you created it was described as to how to use the battery to balance the plane and also how to check the CG in the first place.

The instructions for that plane are pretty good and if followed you will be amazed at how well it will all come together, all you need to do is settle down and think things through a little more. I do understand the desire to "get it right the first time" and to completely understand your airplane (I always research a new plane I'm considering before actually buying it) but trainers are very forgiving planes and if you remember that fact, things will go much smoother. Once you get to join a club then they will most likely checkout your plane before it ever leaves the ground.

Now walking into a new club and having a plane that is properly balanced, well constructed and the pilot having everything to fuel, start and fly the plane really shows that you are on the ball and are commited to doing it properly will go a long way and I am sure that is what you are trying to do.

I am not trying to bash on you or make you feel bad so please do not take it that way.