Angela
I have just renewed my residency application, and spent a day last week trawling around insurance companies. Prices vary on your age, and most will not cover major illnesses within the first year e.g. heart conditions / stroke. Some provided me with a print in English detailing what is covered. Sometimes it's worth investigating and paying slightly more. Also check what hospitals are covered by your insurance, they should give you a list. I found ozan insurance (insurance fethiye.com), very helpful and was given different options for policies. I have opted for a policy which also gives me a free mammogram at the latoon hospital, the price of the policy was comparable with others. It's worth spending some time and shopping around (as with everything in Turkey!). And remember you do not need to agree there and then, I found one agent was especially pushy in trying to sell their policy.
Lorraine