My take on edrums is the main players like Yamaha DTX or Roland TD series are very very pricey, mostly because of their technology in their sound modules and partly in how well the pads are built, be it multi zone or not.
Other smaller players have a different approach, they do away with the sound modules totally, and instead leverage on the power of todays laptops or moreover desktops with the established Drum softwares.
Do a youtube of Alesis USBpro Kit, or RET Drums.
My thoughts on it is, if I already have a quad core, 8gig ram desktop. It could beat hands down any module that comes with a kit out there.
With reasonably priced (very nice playable kit) put it together with an already existing Computer, a midi interface and software like BFD2.
The price comes out to Half of what a 2nd hand Kit like the TD20, with extremely flexible multi sampled or hyper sampled kits of Drumsoftwares, with humanising patches to make the tracks come alive.
In a nutshell I think 5k kits that comes with modules aren't as cool as cheaper kits that are paired up with powerful computers (that we already have) and a $400 software that's super flexible to work with DAWs.
So to answer your question, how bout asking for a discount of half that price, or look at other technologies out there.