You might want to try to find an insurance BROKER as opposed to an insurance agent. I'm not sure how brokers work in Olahoma, but here in Washington state, insurance brokers don't charge client (you for example) for their services. Once they sign an individual or family up for a policy within a plan, they are given a commission from the insurance company directly.
I just recently worked with a broker and had a very positove experience. He walked me through several plans, showed me quotes for the plans and helped figure out what plan would be best for me. I wound up going with Alliant Plus through Group Health which is only available on the West Coast and I'm paying about $280 a month, but my deductable is quite high.
An HMO limits you to seeing only the providers on an approved list. For example, the Group Health side of plan is an HMO, so if I had just stuck with GH I could only see GH doctors. I choose the Alliant option, and it gives a broader choice of doctors. A PPO gives you an even longer list of doctors to chose from; they don't confine you to a limited few doctors to choose from.
If you want specific plans and quotes I would suggest working with a broker. The best way to find one is to ask your doctor for a referral. Since your previous insurance has ended, (so it sounds) you do need to act quickly; the longer you wait, the less likely you are to be accepted on a new plan. Here in Washington, I believe you have 60 days to switch to a new plan without question when you are going from one plan to another. Longer than that, and then you run into health questionaires and pre-existing conditions problems. However, that may have changed with the new health care laws, IDK.
Sorry this is so long, but I hope it helps.