What kind of budget are you looking at? I'm a big fan of the 400's, which could suit your use perfectly as they have both USB and MIDI support (so you could use them to control Traktor if you wanted to). As with anything though, it really comes down to personal choice, and the best thing that you could do would be to try a few out and get a feel for them all before deciding. Alternatively, you could invest in some TT's, and join me on the path to financial destruction!