Yamaha DTXpress/DTXplorer/DTXtreme

Hi,

I have been out of the drums world for ten years (I am 31 now) and 
after trying a td-6 and td-8 recently, I have decided to buy a kit as 
the sounds and feel of e-drums nowdays are far better than the 
previous ones I have tried. After checking the other available 
systems, I became interested in the dtxpress II.

I am planning to go for the following setup and would like first to 
get confirmation from you that the extensions I want to add will fit 
within the available inputs:

Snare: I would add a Roland PD-80R
Hi-Hat pad: I would use the orginal dtxpress 3 zones snare pad
4th tom: I woud use the original hi-hat pad
Extra cymbal: I would probably buy another yamaha one

Thanks for your help