You're itinerary will probably still come out cheaper, but just make certain to factor in Allegiant's fees and features so you're making an informed decision. This seems to be a fairly balanced review: http://www.airlinereporter.com/2010/...he-first-time/.

American is listed as serving KOA directly from LAX; given the extra $170 for HNL-KOA, that might bring Avios back into play.