thanks for all the response so far.
To re-cap then ....... (not taking into account budget for now)
Comanche - fits the mission but maintenance could be the killer
DR400 / DR500 - again, fit the mission but can't be left outside so if no hangarage, forget it?
Commander - fits the mission but availability of spares a major issue
Mooney - again, fits the mission but a (disputed) issue over internal size [also, a VERY minor point, I really do not like the push / pull "rods" for throttle / mixture etc. - can they be changed to be more like "Piper" throttle etc.?]
TB20 - fits the mission but possible issue over load capacity (for longer trips)
Malibu - great, but mega ££££££ - ok, said i wouldn't account for budget!
Saratoga / Lance - again, fit profile but old design and thirsty(?)
Bonanza - again, fits mission but more GPH than the others?
Hmm, this is difficult. So, maybe the original question should have been, forget budget, which aircraft
1. Will cruise at 130+ kts
2. Have range of 600+ nm?
3. Fuel consumption not more than, say 15gph?
4. Can comfortably carry 2 adults, 2 children and say, 30kg of baggage with full tanks?
5. Costs less than £300k
Would i be right in saying, it doesn't exist? ie. its a compromise on one of the above?
thanks.