When we first started playing with Ableton Live, the JazzMutant Lemur was unparalleled. The good ol' days before iPads took it out of commission. We have two of these, one first generation and another second generation. Will always have a soft spot in my heart for these little creatures, programming them was a bit of a hassle, but well worth it. My first DJ gig was using this and it still resonates in my mind as one of my favorite shows of all time. Customizing it to fit your needs was probably the best aspect. Fortunately the Lemur lives on in a great iPad App.

My Lightjams controller.

I bought this mostly because Deadmau5 had it, but this is a very powerful MIDI controller. With this device you are able to make your own MIDI controllers using Lemur's software editor, Jazz Editor. This item is now discontinued and is hard to find, but if you're looking to use the features of this device, they have an iPad application called "Liine Lemur."