If you want a single with good load carrying capability then the 210 is your best bet. I'm assuming you've checked your mission requirements and dont need to go zipping over the alps too regularly (i.e. T or P versions).
One thing to ask yourself how often you will require all 6 seats. If it's not too often, maybe keeping your 182 and renting a six seater occasionally might be more economically sensible (although who said sensible and GA ever went hand in hand!).
Regards,