Yamaha is finally replacing the aged DD-55 model. The new unit is the DD65. I see an extra pad (now a total of 8 compared to 7 on the 55 model), USB, and the bass pedal is even touch sensitive now. I wonder if they upgraded the sounds (the 55's were kind of cheesy in the sound area).

Not an arranger, but I know I've read comments here before that some members own the 55 models and enjoy them.
http://www.sweetwater.com/store/detail/DD65/
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.