My suggestion is that you pay 6% commission with listing agent 2% and selling agent 4%. Do NOT blindly put half and half of commission split between listing and selling sides. Why? Most, if not all, realtors will look at the commission to give priority to sell your house, and at current market, selling agents do most of the works, and with 4% reward, your listing STAND UP that over 5,000 realtors in the country will try to sell your unit. If, in this world, there is only ONE buyer, then one of that 5,000 realtors will definitely bring to you, and your unit will be sold.
Your listing agent will be very happy since s/he would not only get his or her 2% much easier, and s/he maybe even bring the buyers to you to get that 4% commission.
In the mean time, put a claus in the so-called "standard" contract that you will honor buyer 4% if the buyer came to you directly, and place for sale by owner ads in popular website like craigslist.org and keep posting comparable sold info like in the web reference below, prospective buyers will defintely get educated faster and act quick.
Keep in mind, it would be your listing and YOU working together as a team, every un matched buyers, do NOT hesitate to refer to YOUR LISTING agent. Why? your listing agent can show them your competitors in the community, and chances are they will be a match. Once they have a match, you got one fewer competitor in the community. So, do NOT hesitate to help your competitors sold.
Thru out the process, you would act like a Project Manager, and your listing agent is a Consultant of 6 month term you hired, and you need to guide him or her to do, mostly technical, and monitor MLS for you, and keep in informed should any competitors sold, you want to get the info, and BROADCAST in Craiglist so that many more prospective buyers will be interested in visiting your community.
Also create an Yahoo!Group of your property, and get all who have seen your property added, e.g. your realtor, other realtors who did complimentary analysis for you but did NOT get the listing (they may end up sell your unit for that 4%), neighbors, even competitors, all who came to your open house... just every one who HAS SEEN your unit, and you keep broadcasting the updates of your unit, e.g. next open house, bathroom painted, driveway paved ...etc. When you have 75 members in your group, your unit should have been sold by then.
I did an experiment last year 2006 winter, when I got 50 members in Village Pointe at Edison, I got 8 units sold, and later I got all 3 dozens units sold in the whole community. It works perfectly since there is Computer Theory behind this algorithm.