NWR...question re: health insurance

Does anyone have GHI for health insurance.
I pay for my own health insurance and need to find a new company that is less expensive than what i have now which is Aetna for almost $600/month!
GHI is giving the lowest quote but i was wondering if anyone has any feed back on them.
Do most doctors accept GHI? Did you have trouble finding doctors?
Any info would be appreciated.
Thank you