I have had a Socata TB20GT since 2002, since new, and have done ~ 1000hrs in it.
Would buy another one without question. It is perfect for this mission profile. A really classy plane which everybody likes to fly in.
If you did a survey among non-anorak passengers, a TB20 (or a similar 2-door classy type like a Commander) would win over everything else flying. People much prefer the 2 doors (no silly climbing in and out through the one hole) and the big windows.
With all types, there is a big tradeoff between buying something newer (more money but less hassle) and something older (cheaper but more hassle and downtime).
With a TB20 or a Commander I would avoid something very old (20+ years); however you don't give your budget. If you have £50k then you will end up with a right old dog. £150k will buy a nice machine. There is a lot to consider e.g. avionics.
There is an excellent 2002 TB20GT (not mine) for sale right now; M-reg.
VMC - you have a PM.