I bought the basic DTX400K drum kit to see if I'd like drumming and then upgraded it as I went along. What I ended up with is basically a DTX 450K plus an additional cymbal and drum monitor speaker system. Here are the new components, along with prices paid, which were lower than their listed retails, but are commonly available prices online with free shipping:
1) TP70S 3-zone Snare Pad ($99.99)
2) TPCL65 Mounting Clamp for the new snare pad ($39.99)
3) HH65 Hi-Hat Controller pedal ($69.99)
4) 7210 Chain Drive Single Bass Drum Pedal ($69.99) (The 450K now uses the FP6110 Belt Drive Pedal)
5) KP65 Kick Pad ($69,99)
6) PCY90AT Extra Cymbal (99.99)
7) MS40DR Drum Monitor (speaker) System ($269.99)
The two things needed to connect the iPad are:
1) An Apple "lightning to USB camera kit" adapter: http://www.staples.com/Apple-reg-Lightning-trade-to-USB-Camera-Adapter/product_164111
2) A USB type A to type B cable: http://www.staples.com/Staples-6-Silver-Series-A-B-USB-Cable/product_837370
