I've learned that what the guys at ws suggest is solid advice. They know their products. If you are set on pro 60s grab that syn2 and be happy!
By the way, I just ordered my 2010 230 and I'm going back with another z5 rack and 2 485s. I didn't have any fitment issues on my 09 230. I just haven't heard anything that can compair to two 485s on a syn4.
Oh and I don't know what kind of batteries that you guys are planning on running but I just picked up two 3100 series batts from www.bowerbatteries.com
I can't wait to wire these 80lbers up!