Kurt at TractorWorx did a great job regrading (and improving the soil mix and reseeding) my front yard last summer. Reasonable prices, terrific work. Took a few days because he does the work in the evenings, but that was no big deal, and he cleaned up very nicely each day. He even came back a couple times in the next month to make sure the drainage was correct once the soil settled, and the minor fixes were included in his original fee.
https://www.facebook.com/pages/Tractor-Worx/484829551535442
In case you can't use FB, 4120 Pinewood Ter, Chesapeake Beach, Maryland 20732; (703) 963-2294