I generally enjoy longer, continuous pieces of music so that my mood can flow with the music and I don't have to spend time tinkering with playlists.

I started by listening to prog-rock (Pink Floyd, King Crimson), then moved onto sample-based stuff like Dj Shadow and RJD2. Now I mostly listen to EDM/Mashup dj mixes from soundcloud which are great. I've been enjoying them so much I built a small site for finding the best mixes (http://mixtrss.com/).