I picked up the ION Drum Rocker to play Rock Band 2 which was my first introduction to Electronic Drums. Right away, GAS caught on. I immediately purchased a Pintech TC-14 as a 3rd cymbal to use as a HiHat and a proper throne.
Soon after, I replaced the stock ION cymbals with Pintech TC-14s and picked up 2 TC-10s for HiHat open and closed. Then replaced the stock pedal with a Roland KD-8 with a Pearl P900 pedal.
GAS still kept going and soon after I replaced the ION brain with an Alesis DM5. I was now able to use the pads as a true electronic drum set. I no longer needed to use it with the game and could play drums with the speakers attached to the DM5.
However, the DM5 was lacking in features to me. I soon replaced it with a Roland TD-9 and then picked up the FD-8 for HiHat. This was really good for playing Rock Band 2.
That was actually how it stayed for several months. Then The Beatles: Rock Band was released. After playing through the game, I got GAS once more. I replaced the stock ION rack with an MDS-9 and picked up a PDX-8.
Well, within a week of picking up the PDX-8, I ventured to the Classifieds section in this forum and got majorly tempted. I ended up getting a PD-105 for snare and 3xPD-85s for toms. I ended up using the PDX-8 as a 4th tom.
This is the Guitar Hero World Tour drum unit with a Midi input for e-drums which lets me use the kit for Rock Band and other games.
And the TD-9 setup for Rock Band using VExpressions Hodge Podge kit.
I have actually replaced the HiHat with a CY-12H and have 3 CY-12R/Cs coming to replace the other cymbals. It should arrive early next week and will definitely take some pictures to update.