Anyone has 7/8-seaters driver to recommend for 7 pax, traveling from Don Mueng Airport to Khao Yai?

Plan to stay 2 nights in Khao Yai during Jan.

Is it better to ask the same driver (i think cheaper but has to find motel for the driver, & driver may not speak English) or book private tours (no cheap as the tour is charged per pax, but more professional tour guide) directly in Khao Yai?

Anybody can share experience on private car/ local tour booking in Khao Yai? Thanks.