Hawker 800XP or Hawker 1000 is probably all the aircraft you will ever need. Fleet is well supported too - because they built them for years, mainly.
Should be able to get a good one for $3-4m, and i'd be suprised if you didn't get a good lump of that back in 2 years when you realise that the three people that consistently get saddled with the sofa have started to put on a few pounds and are whining that it's not comfortable
