Your best bet now is to buy a drum module like a dtxplorer or something that and a midi to usb adapter. This will allow you to hook up your set to the computer and drummania. You can tac on another $200 for a module and usb interface. Other than that, bring back the ion and get a real kit but then you can't play RB. I got a Yamaha DTXplorer module from
Musician's Friend | Your Online Music Instrument & Pro Audio Store | Best Prices, Great Service. Sometimes they have scratch and dent models and you can save some money that way.