I would totally go for the Petzip if it was in black and white. The tan is just too light for me, otherwise I love the stroller.
I'm leaning heavily towards the eBay off-road stroller. It's got 12" tires which from what I read of the reviews, are great for mud and rocks. Here's another site that carries it...
Dog Strollers And you can order it in black plaid which should look like this...
http://imgs.inkfrog.com/pix/bjnaf4/Pet_stroller.jpg since it's possibly the same brand.