Another thing to consider is fuel burn and payload! Once you get used to flying a complex and want to take it further afield think about how much more fuel a bigger engine will burn. A PA28 Warrior about 30 litres/hr and a PA32 Saratoga about 80 litres/hr if you lean it off! Also the PA32 can't carry the weight because the plane is too heavy to start with. Even though it's a 6 seater, it's on the limit with 4 adults and full fuel! One aircraft I would recommend is a TB20. Good fuel flow about 55-60 litres/hr and even though a 4 seater can carry 4 and full fuel at 160kts. So consider what plane because it might be the difference between non stop and one stop! Good luck! Flying Complex is great!!!