That's a lot more than I'd be wanting to spend on a pair of jeans, no matter how awesome. And from what I could tell from the description, the only kevlar lining is in the knees... they use kevlar "yarn" in the rest of it. I assume that helps with abrasion resistance some, but it can't be as effective as the lining.
I've seen this company recommended before, although I haven't bought anything from them.
http://www.hoodjeans.co.uk/ Their jeans are lined all the way around the hips, down to the shins in the front and to the knee in the back. They're expensive, but less than the Dainese jeans. With exchange rates, minus VAT plus shipping, they're about $140/pair.
From the description of the lining on the Draggin' Jeans site, I'd go with those or the Hood's instead of the Dainese. I may be ordering a set of the Draggin' sometime soon myself. I have a pair of riding jeans, but I need a couple more pairs. I'd order more of what I have, but they're discontinued, which is a shame, because they zip off to shorts, which is amazing for when I get where I'm going.