Start-up for Print Gocco

Hey, I'm looking for advice on print gocco materials. I've had a look around at the different models. I'm wondering if anyone has advice on which model to buy (for beginners). It looks like the B5 and B6 are popular. Any preferences? Also, what's a fair price to pay? I'm seeing some listings on Ebay. I just wonder what I should expect to pay etc.

And finally, do the gocco-ers out there enjoy the process??