Reliable? Go for a CL850(CRJ200). Hard to kill this things as they are used to line operations. Much less downtime then a CL6XX or CL300.
As well very cheap to get this days. Range usually easy 1500NM, if you get one for LR ops with the tail tanks then realistic 2500NM(3000 NM in the shiny Bombardier brochure).
6000ft runways no problem , especially no high airports(which could bring a problem)in the caribean.
Other advantages - HUGE cargo hold, often even 2 toilts(1 fwd, 1 aft)
cheap to get(if you think you get a global cabin for peanuts). Pilot training easy(sims everywhere) and cheap.
Disadvantage: No slats, approach speeds up to 140kts at max landing weight(21205kg) or even a touch higher with 21319kg.