The Alpi Pioneer 300 would fit most of your requirements. I've got one and think its the dogs boleaux. See
Alpi Pioneer website
2 seat, retractable gear, aerobatic (though not certified for aeros in the UK), 135kt cruise @ 16litres/hour mogas, 4.5 hours endurance, easy to build. Not trailerable though.
Mines a pint of Stella
