This is what I have:
kneedraggers.com
I wanted something more "low profile" for casual riding, and they fit the bill. They have CE armor for your knees, in addition to leather lining in the impact and likely abrasion areas. They're protective, comfortable, fairly discreet, and oh yeah... can be had at a great price! I don't know how they'd hold up in a crash (and I don't want to find out either!), but I think Cortech makes quality stuff, so I'm confident they would serve me well...