After browsing Youtube I came across two interesting kit built aeroplanes, the One Design DR1-07 and DR-109. These two aeroplanes are capable of +/-10G and you build them entriely out of metal tubing, wood and fabric. The DR-107 has a cruise of approx 139kts, climbs at 2100fpm, has 160hp, stalls at 55kts and has a MTOW of 522kg while the DR-109 cruises at 155kts, climbs at 2800fpm, has 260hp, stalls at 50kts and has a MTOW of ~1000kg. The aeroplanes are incredibly aerobatic and the DR-107 comes with a half decent price tag of $40,000 (second hand) with an AEIO-360 (aerobatic fuel injected) engine. Not bad considering an extra 300 will set you back $180,000USD + second hand. Neither of these aircraft should or can be RA-Aus registered, but they'd sure make an excellent aerobatic aircraft in GA.
See here for pics: http://www.dr107.info/ForSale/N105DR/N105DR_For_Sale.html
-Andrew