Yamaha DTXpress/DTXplorer/DTXtreme

Okay, don't have my DTXpress III yet, but I'm thinking about upgrades 
already.  I like the rack-mounted hihat pad that comes on the Roland 
kits, but I've heard that people have had limited success getting them 
to function with the DTXIII module.  Are there any alternative hihat 
pads that I can mount on the rack like the stock one, preferably with 
edge triggers?  I'd consider the 3-zone TP-65S, but I'm concerned 
about the rim wear, plus, it doesn't look like a hihat pad. Even 
though the hihat/stand that comes with the III SP probably would be 
ideal, I don't want to use a separate hihat stand.

Thanks!