With a call sign like "3-D Tony", it could indicate where you are heading? If you are doing well at 3-D with the foamy and simulator you are ready for a glow at least. Gassers are more $$$. I am definately biased because I have had 2 60 UCD's & love 'em. A 60 UCD will do all the 3-D stuff but I found it did not harrier well until I modified it. (all the mods are in the UCD thread)You want good thrust/weight,1.5:1 or more,I use OS 1.08,8lbs dry weight. You want an engine that runs perfect,at idle,mid-range and high end,nothing else will do. When you get into 3-D with a glow or gas,you will have to experiment with different props,you want lower pitch(I use Zinger 17X5 cut down & tapered to 16.5X5) to get quick spool ups and lower speeds at high throttle. I've used many other sizes & pitch but they all pulled too much,would always be climbing in a hover. The UCD is only $155 if you use the Tower Special add #,so its cheap,no major worry and will get you pretty far into the 3-D realm if you are willing to tweak it a bit & practice. When you get board with a "Do",you might want to move on to 3-D planes with more conventional air foils,YAK,Extra,Giles,Caps ect... & so forth...people like the looks of a scale aerobat,many hate the "Do"'s awkward appearance.( I could care less myself because I'm having fun!!!!)