I think if you jump to the Extra it'll carted off the field in a bin bag before you've run down the 1st battery !!!!!!
LeoL suggested the MiniMag, it's what I went to after the SuperCub and in my opinion absolutely fantastic plane.
I recently flew a newbies T28 to help him out at the club but still think I prefer the MiniMag and it'll last twice as long / much more durable but the T28 has the looks !!!!!!!
When you've had you're aileron trainer, have moved the CoG further back, upped all the throws and it's become the plane that's limiting your aerobatics not your ability and can fly inveretd almost until it's boring - that's when to have a look at something like the Extra as they're totally different beasts !!!!!
You'll be suprised as well at how much more powerful the MiniMag is than than the SC with a decent brushless motor, I flew both the other weekend as I took a complete newbie out with my SC and then launched the MiniMag which my son is now flying.
Would suggest sticking to foam for now though whichever route you decide to take.