redEva... that is probably the most incredible collar I have ever seen.

Oh, and to answer the original question. You definately need to choose something that is comfortable and practical not only in the daytime but when you are sleeping and playing. Something that is restricting might feel nice but when being fitted you need to move your neck around a bit so that you know that you have some breathing room and that it won't become too restrictive in all sorts of positions. You want something that is durable. Pretty is nice but practical is what you really need to think about when choosing a "full time" collar.