It's not likely you can get the OTA DT stations in Kaneohe due to the Koolau's and the fact that they all transmit with limited power. Check regular channels 9,20 and 32, those are adjacent channels to a couple of the DT stations and will give you an indication of the possibility of receiving the DT stations.
As for other than Oceanic, here's what's available HD wise.
Directv: 101(Main) 36"dish, 110(HD plus Chinese pkg) 24"dish and 119(HD and Spanish pkg) 18" dish. If you don't truly care for the main programming, you can use a "Gain Master" dish(36" x 28") that combines 101/110/119 on one dish. However, you will lose the 101 (main) signal when it rains, which in Kaneohe can be problematic.
Dish: 119(Main) 24" dish, 110(HD/PPV/Sports) 24-30" dish. Can also use the "Gain Master", but the 101 slot will be null.
Another "option" soon will be StarChoice, a Canadian Sat. service. StarChoice is launching a new satellite (111)
in the spring that will be receivable in Hawaii with a 39" dish. StarChoice non-HD programming(107) is already available with a 39" dish. Search these forums for "grey market" or "starchoice" for details.