Correct me if I'm wrong but isn't the citation mustang fairly useless in terms of carrying a load? I don't know numbers but one pilot who was operating one out of PDX mentioned that they could only carry full fuel plus a duffle bag... That full tank of gas gets you maybe 900-1000 miles???
Personally, I'm NOT a fan of single pilot jets. Especially owner operated. I'm sure there are plenty of owner/operators out there who do their due diligence but for too many it is an extension of their ego. The accident rate in this sector is proof of that fact.
A guy that I used to fly for (an owner) said that the savings in his insurance premiums by having a second pilot justified the second salary. Think of all those benefits you get from a second pair of eyes in the cockpit... When things are fine and dandy chances are single pilot guys will do just fine (I say this as a former piston twin single pilot Cargo dude, I've been there) but when things get really busy and you approach task saturation of your working memory things can get ugly with only 1 person at the controls.
Go spend the money on a PC12 and pay a guy a contract rate to sit in the right seat. The rest of the aviation community will appreciate your due diligence.