Medical Bill Question

Several years ago I had to go to the emergency room. I had no insurance and I never received a bill from the hospital. One year to the date of my hospital visit I get a letter from a collection agency. I had no money so I ignored it, they never hassled me. A year later I got a letter that was suppose to look like it came from an attorneys office offering to accept 50% of the bill and call it paid in full. At this time I had a little money. I paid it and it has never showed up on my credit report.

About two years ago I had to have some blood work done and the cost was almost ten times higher then what I paid another hospital 20 miles away. I was outraged that the price could be that much higher from hospital to hospital. I have not yet paid or made any payments on the bill.

I could pay it in full with no problems, but I am one of those who stick to principles come hell or high water.

The account is on my credit report and is now with a collection agency who has never notified me by mail but calls every day. (my credit is still listed as good BTW)

The total is less then $1000. The collector has yet to make any threats, their messages say they "have a decision to make and would like my input... yada yada yada...."

Question: Do I offer them less money or do I wait and see if they make me an offer?