Hi Timetodoit.
Since you are using Photoshop see http://sites.google.com/site/3dbasecamp2008/all-sessions-2008/taking-your-models-into-photoshop
on how to "render" in PS.
Yes printing straight from SU is rough. But also have you tried exporting .png at high resolution and printing that? Still not a rendering but much cleaner.
I am looking, like yourself, and checked out Kerkythea, but this is not so simple as loading a Mac app on your Mac. Stopped me, until I can spend time loading and learning the software needed to run it. Looking forward to the Mac Podium.