Electric drums?
You also need the "brain" that the pad plugs into, and the amp to make it loud. If all you want is a few "add on" sounds, Alesis makes a control pad that can plug into their SR-16 drum machine. They would be $350 for both. Another way to go is the Ya...
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What exactly do I need to record drums? (decent quality)?
You're going to have to get a mixer with a USB or Firewire output. Behringer makes several, also Yamaha etc. For acoustic drums you'll need one with at least 4 mic imputs (more would be better). You don't really need special drum mics - Shure SM57's ...