Planes balanced the way Jim described are easier, IMHO, to hover than a nose heavy one. They pretty much do everything better as far as aerobatics goes. You just have to watch for elevator stalls at slow speeds.
I like a hands off plane upright or inverted, but a hair of down pressure for inverted doesn't bother me at all. As long as I'm not holding 1/4 stick to keep inverted flight, I'm OK, pending it does other things well.
Just be careful not to convince yourself that the plane does the hovering. The pilot still does tons of work to keep the nose up on the small profiles. Some planes and set ups are better than others, but none are easy, until practice prevails.
As for the Magnum, some of the older Magnums had carb trouble. The newer designs are much better. Power is pretty much in line with the non-hot rod engines of same size. For example, it will probably not out pull an OS 46 AX or a Webra 50, but it will probably desimate an Evolution 46 or anything with LA in the name. If you fly it for a while and decide you need more power, the exhaust port should be similar to other engines and you can look into a tuned exhaust for it.