Yamaha DTXpress/DTXplorer/DTXtreme

Does anybody know if its better to go with three TP65S pads instead of 
three TP100 to replace the single zone TP65 pads that come with the 
DTXPress IV Special. 

The only place I have found the TP100s for cheap are on Ebay used. Are 
they really worth the hastle? I found three TP65S pads for $180

Also does anybody know where I can get the TP100 the cheapest.