My name is Mike Gallagher and I am Broker in Charge at RE/MAX Honolulu.
As for the best opportunities to buy an investment property on Oahu I would visit my website at http://www.hawaiirealestatestatistics.com
Here you will find the current activity levels of interest of buyers for all major areas of Oahu. You will also find my "best buy" areas for all of Oahu's SFH's, Condos and Town Homes.
I wish you much Aloha,
Be happy to help represent you , Rob Huber RA
Good question though, it's hard to choose. Ewa will have further price declines. I think Makakilo 2 BRs townhomes will always be strong.
1 and 2 BR high rise condos in Kakaako, at the right price. 2 BRs in Waikiki can cash flow at the right price and 20%-30% down. There aren't a lot of 2 BRs left there.
SF homes in the Kaimuki and Diamond Head areas are looking good.