I've been really looking at buying the U-Can-Do 3D .46 from Great Planes. It has a great reputation and all the guys at the local airfield love them. In fact, in the club, there's over 9 of them. So I have the Hobbico Nexstar and I've learned to fly on that great with the help of RealFlight G3. Now the guys at the field are suggesting me move up to the next level. They say I could take out everything from my Nexstar and put it in the UCD, along with the extra servo or two and wires I might need.

The Nexstar came with a .46 FX and I was wondering if that would be sufficient power for the UCD or if it would be a better choice just to buy a new engine (maybe a four stroke). The 3 main engines everyone seems to have in their UCD's are the OS FS-70 Surpass, the YS .63, and the Saito .82. I could also go with the Saito .72 if the .82 is too much power (yeah right!).
Another engine from OS is the FL-70. It's $30 less than the FS-70 but the advertising says it has 20% more power and weighs less. I don't know how it's less than the FS-70 then.
I really need your guys input on this. Thanks a lot in advance!
Cojim14