Heroic maps creates some amazing maps. Also a cinch to use in a VTT. If you know Photoshop the sky is the limit, if not no worries as all the maps are high quality, and the moduclar sets have endless configurations.

My players always comment on Heroic Map's maps, they love them.

If you have not used their maps or are on the fence, just hop over the fence and trust they are a great value. Lots of talented map makers but Heroic IMO is the best.