You have gotten some great feedback here on Trulia! Congrats! (Trulia is a really cool site!)
Yes, a discount broker will get you MLS exposure, which will get you out to TONS of sites that populate with MLS data. (The MLS is definately the way to go for exposure!)
Prior to listing (whether with a full service or limited service brokerage), make sure to do your homework, interview more than one agent, and ask lots of questions in terms of what you will be getting, what you will be paying, what services to expect.
I wish you the best of luck with your home sale!
Live good. Be happy. Be a smart seller! : )
Mimi Osterdahl / The Muljat Group Realtors / Bellingham, Washington / http://www.LiveGoodBeHappy.com
2008 President, Northwest Washington Women's Council of Realtors