the 4 seat jabiru series, cruises at 120Kts, 4 seats..... the Cirrus line.....
None of which haul 500kg's for 4 hours @ 160 knots and cost under $200,000, not yet anyway...
Cheers, HH.
PS: I do realise these aircraft cost less than $200k, but of the new generation aircraft, nothing with this sort of capacity cost less than 1/2 mil.