Yamaha DTXpress/DTXplorer/DTXtreme

I was looking at buying a used DTX 2.0 drum module to replace my 
DTXpress 1 module hoping that it has more features, inputs and 
outputs. Maybe even better samples.

But is the DTX 2.0 better or newer? And what's a good price for a 
used DTX 2.0 module?

Thanks, Steve