I use midi over usb to Superior Drummer and/or Addictive Drummer using this DIY kit I pieced together and it gives me more flexibility that most of the full Roland kits.
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I configure the bottom four on the pad as Toms, top 4 as cymbals. Snare on center, ride on right, hihat on the left with pedal and a double pedal which feels very comfortable and real. I even set the top right pad as dual zone so if I hit it lightly it is the bell of the ride, but hitting hard is a cymbal. All 8 pads are dual zone, externals all dual zone as well with same ranges feel as TD30. Plus its compact taking little space and easy to move since its all mounted off the stand.
Just to give you an idea,
Roland SPD30 Octapad = $800 new
Roland PDS-10 Pad Stand = $140 new
Yamaha KP65 Kick pad (just as good as the roland) = $70 new
DW Doublepedal = $200
Roland PD-85 for snare on ebay $100 used
Gibraltar SC-SLRM Single L-Rod Mount for snare = $30 new
Roland FD-8 hihat pedal on ebay $50 used
CY5 (hi-hat) and CY8 (ride) on ebay $50 each used
Gibraltar SC-GCA Grabber Cymbal Arm for the CY5= $25
PEARL AX25L (to insert cymbal stand) = $30 new
Misc cymbal stand connected to AX25L for CY8 = $50
Total DIY Kit build giving you a 12/13 piece kit = Approx. $1595
Sure you could get a Roland kit for $1500 but it wont be anywhere near as diverse.