SF260
Have a look at a Siai Marchetti SF260, I have had one for 25 years and can't think of anything else that ticks so many boxes. 170kts cruise at 50 litres per hour, low wing, a sturdy O-540 six cylinder up front, 4 seats, aerobatic handling like a swept wing jet and at 1102kgs max weight cheap(er) landing fees. OK, the 250 lbs weight limit on the rear seat means the two kids in the back will have to be off loaded once they grow too big, but by then they won't want to come on holidays with you and the wife in any case. It's different, looks great and always draws a crowd; parts are easy as they still make them after a 43 year production run with nearly 1000 units sold to date.
The only problem is finding one as no one who owns one can find anything better! Be carefull, the ex-military ones can't get a full CofA, and they aren't suited to short strips at anything near max weight. I'm 6ft and have plenty of room, and visibility is superb with the large canopy.