John,
Before I would be willing to recommend a "next airplane," I think you should give us some info on where your flying skills are at today. Can you loop? Both ways? Can you fly inverted? Lazy eights? If you can do most of the stunt pattern, which maneuvers are you still missing?
For example, we don't know if you can consistently fly inverted. If you're not there yet, then you need a plane that will take a beating--one that does not take too long to build or cost too much--to master inverted flight. I might immediately suggest a SIG Skyray. With the right engine/tank/prop it is very capable and since it does not have flaps is a lot easier to build.
On the other hand, if you are already doing the full pattern, or maybe just short a maneuver or two, then you are going to want something as good as the Nobler (as long as you are not constantly hitting the ground), although it definitely does not have to be a full fuselage plane.
As far as building skills, generally those go thru a learning curve too. We're not sure where you are at right now on building skills either. What else have you built? Or, how many ARFs have you assembled?
A few things to consider:
1. A profile plane is always quicker to build. It is easier to get the controls into, and since they are more exposed, it is easier for someone to help you trim and adjust the plane as well as catch any building mistakes. You can always post pictures here of the plane as you are building it if you think something is not quite right
2. If you keep to approximately the same size planes, then when you get a really good engine/tank/prop/muffler combination, you can move parts between planes in case of mishaps. You can buy spares if you can afford it, but if you can quickly switch tanks or engines or props, or..... then you might still be flying instead of fixing a bunch of very different planes at the same time.
3. A plane that is initially quicker to build is also generally quicker to rebuild. Full blown PA stunt machines are very, very cool but take a lot of skill/time/money to make them that way.
4. There are plenty of great planes out there for the intermediate level. Everyone has a favorite. You will hear endless discussions of the SIG Twister--with a whole bunch of mods that some feel are mandatory, or else the Wright Bros might never have gotten one off the ground. People like the Twister for good reasons. It is a solid, mid-level performer out of the box. So is the Banshee with a few caveats. But ya gotta build all of one of these. No ARF Twisters out there. It is one of the easier full-size stunt planes to build, so for learning building skills it is perfect. The only things easier are likely to be some 1/2A sheet jobs. Some of those actually work ok for beginner training too. And at a far lower cost, if that is a factor. If you fly over grass, then they are very survivable.
Good luck with your project(s),
The Divot