If pullout from hover is as important to you as hover is - the UCD 60 is not an ideal match for the .91. The 91 will fly it and do most things but it would be the minimum power to 3d it. I started with a Saito 1.00 in my UCD60 then upgraded it to a Saito 1.25 and 16x4W prop which is almost a perfect combination (a YS 1.10 would be that).

If you are serious about 3d - ignore any prejudices you may or may not have and consider a profile - the MoJo 60 is an excellent match for the 91 as are a number of other profiles such as the OMP ones. These are seriously good 3d planes and, talking from experience, the MoJo is about the strongest plane I have ever had - very important when learning to 3d.

Otherwise the Funtana X-50 or the UCD 46 as mentioned earler are both good matches.