I just got a blue one from ebay last month, and I'm very pleased with it.
The way I understand it, the pink one can punch acrylic better (although I've been told the blue one can do it, too). It also has the features that Gale mentioned, but I've found none of those are a big deal. Continuous punching on the blue machine is quite simple once you've done it once or twice.
I got mine for half of what I would have paid for a pink one, and I'm still glad I saved the money. HTH!
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