You've had several pretty consistent responses to your question, and I can't really quarrel with any of them, other than perhaps the non-answers that just say "Call Me!". I envision Trulia as an information site as much as an advertising medium for Realtors, so "Hi, my name is Suzie Smith and here's my number" don't really serve much useful purpose. But I digress...
There is no fixed local commission - anywhere in the United States. There are certainly local norms, but any effort to "fix" real estate commissions in any market via broker collusion would be a Federal Trade Commission violation and we'd all be in a lot of hot water.
That being said, the old expression "you get what you pay for" is a good rule of thumb. A highly qualified Realtor will compete for business - you'd have to be way too smug to sit back and tell the world "this is my rate, take it or leave it." Don't let me convince you that there aren't plenty of smug Realtors out there who do just that. Personally, a good listing is worth competing for - I could hope that I'd someday discover that I had too much business to be interested in a good listing opportunity.
Keep in mind that the commission that you offer is part of the marketing of the home. Commissions are our income, so anyone who tells you "I show every home and I don't even look at the commission offered" must be an awful good poker player, if he/she can keep a straight face. Offer a low commission and there are a certain number of prospective, qualified buyers who are never going to see your home. If Agent Johnny can show your beautiful home that offers 1.5% commission and Neighbor Bob's home that offers 3%, guess which one Johnny is going to take his clients to see?
The answer to your question is the essence of a strategic conversation that you should have with every Realtor that you interview. They'll have some advice for you about how to market it - you'll have some entirely deserved opinions of your own about what you're willing to pay and why. An excellent Realtor can make a strong case for his/her advice, but an excellent Realtor also listens to their clients' perspective, as well. If you have a magnificent fly-off-the-market home, you're more likely to get away with offering a low commission. If you're home is one of many similar homes in a particular bracket, you may need to offer an attractive commission as part of your effort to get your home seen first.
Choose a few Realtors and invite them over to see what you have to sell. Like I said, they'll have many suggestions about how you should market the home, and the commission structure will be a part of those suggestions. If you and the Realtor can't agree on any part of the marketing strategy, move on to another Realtor.
If I can help, please let me know. Best of luck to you!
Villa G Realty