There's a sticky, thread at the top of this forum, on what planes are available.

In it you will see "Intermediate" or "Second" planes. These are all possibilities. They'll be fun, and you can definitely do aerobatics you seek.

As for electrifying any of them. Personally, I'd stick to the ones with open engine compartments. Why? Easier to work with. Trust me on this. Fitting an electric motor and ESC to a plane with a cowl can be a hastle. Don't want to discourage you. And if you're bound and determined to do so, go ahead, have a blast.

Also, if you look around and do searches here, you may find people that have already electrified some of these aircraft, and can get you started with motor/ESC/battery configs from the get-go.

I'd probably stick with a .40 sized bird. Price for electrifying increases and an expanding rate as the size goes up. In other words it's not a linear escalation, closer to a exponential one.

Try to come to a "standard" battery setup. Pick a couple battery sizes, if you can, and stick to them. As stated earlier, you can gang and chain batteries together to come up with different setups. So if you stick to a few sizes/shapes/capacities... it'll pay off down the road.

Good luck, and let us know what you decide to do...