Consider breaking down costs.
Initial outlay - This is the same as considering whether you want a BMW or a Ford Focus.
Maintenance - Permit (ie LAA/PFA) aircraft will cost less to get serviced.
Insurance - ordinarily linked to outlay.
Hangarage etc - again, the cost will be pretty much the same regardless of aircraft.
Consumables - fuel is expensive. Think about consumption and type of fuel.
My only bit of direct advice - Find something with a Rotax engine as it will half your fuel bill.