We've dropped the turboprops, and are now looking for a light jet to seat at least 6 comfortably. In the 4-7 mil. USD range there is an endless que of new or used A/C for sale.
If buying a used it must be well maintained and up to JAR OPS 1 standard as it's going on an AOC. I'm very reluctant to buy one from outside Europe, as they are usually not up to JAR OPS standard and requires a lot of (paper)work.
A year 2000 Lear 45 with only 1500TT is seen @ 6.7 mil. USD.
Or a Citation VII 1998, 3000TT @ 6-7 mil. USD.
Or a (a bit larger) Hawker 800A, 1990 with 5100 TT, @ 6 mill. USD.
Or smaller CJIII ??