While cost of capital is very important, it is impossible to understate the difference in operating cost between a Cirrus SR22 and, say, a Phenom 100...and the operating cost delta between a Phenom 100 and a 25+ year old Citation II (or any flavor Beechjet) is almost as staggering.

Lots of people are lured into the turbine world by a cheap acquisition price thinking "that'll buy a lot of gas", then get sticker shock at the first month's fuel bills, ****ed off at the first unscheduled maintenance event, and sticker shock again after the first scheduled maintenance inspection.

Based on the stated mission and the aircraft you are currently operating, I think a TBM700C2 would be the best option. Yeah its only single engine, but it has long legs, good cruise speeds, **very economical to operate**, with the capability to carry 6 people a fair ways. A Meridian wouldn't be a bad upgrade option either, but they don't have good useful load, so anything more than 3 people in the plane and you're seriously cutting into range.

If you want a twin turboprop, I'd skip all the 90s and go straight to a B200 but take a look at a Turbo Commander with Dash 10 conversion.

If you're thinking of going from a Cirrus straight to a twinjet...you are going to have to do a LOT of legwork to make SURE the company knows what they are getting into financially. In that case, a CJ1 is probably the best most economical option...ESPECIALLY if you have any plans on flying it single pilot.