Best places to rent gear on Oahu and Maui?

I'm going to Hawaii in March (2 weeks Oahu and 2 weeks Maui) Not bringing own gear this time due to our travel route, so I guess my question is; Where do I find the best equipment for rent on Hawaii? (Preferarrably Gaastra, Tabou, Starboard, Simmer..)

Any input is highly appreciated?

Pål - Norway.