I'm not sure if you are still looking for advice, but I own the Boss Dr. 202 and I love that machine. Programming is a breeze and it even has a bass function so you can add to your drum tracks. I got mine on Ebay for $150 and it fits all my needs. It is one of their older models, but still ranks up there as a great drum machine. It comes with the 808 and 909 drum kits along with some analog and older-type sounds. It has real time effects and filters that can spice up your drum tracks.
It also depends on what type of music you are looking to make. I use it for trip hop type beats, but it was made for Hip-Hop, Techno, Jungle, Drum 'n' Bass, Latin and more. There are some weird sounds in the machine, but overall it is great.