Been flying UCDs for years now, many think it's a bad choice for 3D, but I've learnt more with these than any profile.
In any case, just my opinion but if you want 4 stroke and have the $ go for the YS63. I use the 110s on my 60s and have totally unlimited verticle. The 63 will out pull every other motor listed (except maybe the saito 100).
If 4 stroke is not an issue and you want unlimited verticle, the new OS75, same size as the 60.
Just remember that with any of these choices above say a OS55, DO NOT use full power unless the nose is pointed up. Else I gurantee flutter followed by total destruction.