As much as I like the RV aircraft I think my vote would be for the Extra 200.
I found the 200 a very nice aircraft to fly, the 200HP engine keeps the fuel costs down and also keeps the stress on the airframe down further reducing cost.
On the whole I found the 200 a much more enjoyable aircraft to fly than the 300 with more than enough power for "fun aerobatics" but short on power for other than basic competition aerobatics.