I like CafelaPooch. They have a sister site for collars and offer ones that can be embroidered w/ pet's name and phone number. Here's a link to those:
furry friends
I know you weren't looking for tags, but have you seen the Red Dingo ones? I really like the Red Dingo tags. They are very small - we have them and they don't make any noise (nor do I worry about them getting caught in their crate, etc.) and are a much better quality than ones purchased in pet stores. I was initially worried that one of my boys in particular would be grabbing at his brother's tag. It's been a non-issue. We get lots of compliments on them and even the vets office wanted to know where we got them. (I spoil the boys and just bought coordinating reflective leashes for them. Very cute and great quality.)
Good luck shopping!