Yeah I'm kinda late on this but I haven't been on for a couple of weeks now.

If you really like the PK Rippers, SE has made a new limited editions of the PK Ripper Looptails (Retro Model)
I actually sat on one today and it brought me back to them old days LOL.
The bike is made really well and while I didn't get to ride it (it was a customer's bike that was waiting to be picked up) It felt really nice.

check here for the bike and specs.
http://www.sebmx.com/2007/bike-detail.asp?id=22

I'm also planning on building a Retro Quadangle Loop Tail