Hawaii Trip Recs needed.....Specifically Volcano Copter tours.....

Going to hawaii at the end of may. It appears that most of the decent tours are out of the big island in regards to seeing active volcanoes.

Which company gives the best bang for your buck in regards to helicopter tours?

Mind you, I'd really like to do a tour that includes flying up to the point where the lava is flowing into the ocean.

Thanks in advance.

Also we are staying in oahu for most of our trip; so what airline is cheapest to get from oahu to big island?

Also any cheap hotels for a night while at big island?