IMHO... if you are in a BUYERS market trying to sell a house for RETAIL value and you want to get the most ATTENTION on your property early on, absolutely find the best Realtor who specializes in the type of property you have for sale and pay them GENEROUSLY. (It's different when it's a SELLERS market.)
Realtors are paid on commission. If two properties are basically the same but one has a higher commission, they will push it over the other. So would I!
I would price the property competitively also not reaching for the higher dollar, unless the property is really special. Maybe even do something special that makes your house stand out... "The 50" plasma TV in the Living Room Stays!", or something that makes your house better.
Go to open houses of competing properties in the area to see what your buyers are seeing. See who has listed the properties, and experience how hard they work at the open house. If they just sit there and don't try to SELL you in some way, they'll do the same when they host your open house. You want a Realtor who will SELL for you.
In hiring the Realtor, I would get a specific performance commitment from them, detailing what they will do to market your house, ads, open houses, online postings, fliers in front of the house. Don't just settle for signing a contract, tying your property up for 6 months with a Realtor just waiting for a buyer to show up off the for sale sign.