thinking outside the box why not a pipistrel Virus SW, it has the option for a full glass cockpit, 140kt of speed and a 800nm range all on between 3-4 gallons per hour (depending on engine).
it's only a 2 seater but i don't know a cheaper way to build flight hours, base price is about £45k but i would expect that to be more like £80-90k with options.
just a thought.
fats