I would say 46FX. BTW, hovering actually doesn't require a ton of power. What requires a ton of power is having the airplane pull out of a hover vertically like it's a sling shot. Although that's not necessary for all fliers, it's a matter (luxury) of personal preference. I have this Fun Air 3D with a 40 FP and it will hover right around 75-80% throttle and I'm really I'm happy with that. Why? Because I also have the low wing loading which is a great benefit to doing many aerobatic manuevers. A 40FP is a lot lighter than 46FX, uses way less gas, so a smaller tank and hence lower flying weight is possible. With a severely overpowered airplane, usually you have a trade off of it being heavy and high wing loading. So the 46FX will be perfect IMO. I personally put an Irvine .53 in my Magic Extra and it pulls out pretty strong (APC 12-6). It's also not much heavier than the 46FX. I just didn't feel like buying another 46FX since I already had one (I like variety). If you get the 46FX, an APC 12-4 or 11.5-4 are both good props for 3D.

Joe