I went with Delrin bushings, still sitting in a box somewhere around here. I have heard that the superpro give a little less vibration, but I don't hear many people complaining about the Delrin.
You don't need a press, but it will make life easier. I got a quote from a local machine shop to push all the bushings in for $75.
PillowBall DIY Thread:
http://www.maxcooper.com/rx7/how-to/...lls/index.html
JimLab has a nice write up as well. Maybe someone will post it for you.
~M~