You'll have to give us a bit more information. Firstly, what exactly does "budget-minded" mean in this case? Secondly, will the whole Kona thing be something the airplane will be doing all the time or only occasionally and, if it's the latter, what will the majority of the flight profile look like? Thirdly, how many people and/or how much stuff will you be carrying? Fourthly, how much flying will you be doing (hours per year)?
Start with that.