I almost opted not to post, you've had a lot of information to digest. I do not know your market. If I were talking with you here is what we would cover:
1. Your situation. Where are your moving, why, when do you need to be there? I want to know how you could lose? If the market going up? going down? Where you are moving: going up or down? In most cases their are hidden costs that the average home owner is unaware.
2. What you need to net out of the sale. In most cases my experience has been that I can show a seller that I actually save them more than the amount of my comission in the marketing and negotiating process. My goal is the same as yours, so help you get the most net profit. You are concerned about the commission, I am concerned with protecting the other 90% Plus percent.
3. 90% of the time another Realtor brings the buyer that purchases your home, so you do not want to ignore them, right?
4. 90% of the time, the listing agent does not bring the buyer, so you really need to market to other Realtors. As a person selling on their own, you are not able to do so effectively. Of course, you could use an MLS only (limited service) broker. You'll be paying the buyer's agent their side, plus the fee to the MLS only broker, plus doing all your own marketing.
Question - who represents YOUR interests. You pay a flat fee to a MLS only broker, who advises you on how to get your home sold "for the highest net profit"? Not the MLS only broker. They never set foot in your house, and in most cases, do not know the market.
So, truthfully, you are a seller without professional representation. As I said initally, I don't know your situation. Usually time is money. Just as an example, you seem to think that 30 days is really not important. Would it have mattered on September 1, 2001? How about on September 1, 2007? The truth is, no one knows the future. No one foresaw the mortgage market hiccup coming, at least not the way and the severity it came.
I am dealing with clients now that, because they "did it on their own" saw their home's value drop 10-25%, even 35% below their expectations. Again, maybe you have money to lose. Most of my clients do not. I do not advise on trying it yourself unless you are prepared to pay the price.
Best of luck to you!