Yamaha DTXpress/DTXplorer/DTXtreme

My KP60 has packed up for a second time, and I dont consider myself 
to be a hard hitter. Oh well never mind.

I would like to know of a decent alternative which is compatible with 
DTXPress and where, if possible to buy mail order as I have just 
moved to Germany.

Any Ideas?

Thanks in advance.

SImon Rowe.