Looking to pump, maybe DJ

[gotham]

Pump tracks seem to be all the rage these days, and since I'm planning on more time in Whistler this summer, I wanted to get a pump track bike, maybe even learn how to jump. Trouble is that I don't really know what to look for. I had a P2 a few years ago and it felt clumsy.

What's the difference between DJ1 - DJ4, Argyle etc?

Any benefit to just getting a rigid fork?

Gears or single speed?

Should I just pick up a beater for $400 or will I notice any difference by spending more money?

Cheers.