Not a lot of stores carry DH Labs. While not exactly a direct to consumer brand, they don't spend a lot on promotion or packaging. I see their cables in places like Cable Company or Parts Connexion. Audioquest/Cardas they are not. Order direct and you'll get your cables in a plastic bag.
I run Q-10s and like them. Replaced Kimber 8PR and sound a little brighter which I like. I would think the Preludes would give you same as other copper cables, nothing less. Personally I would go with T-14s, they aren't that much more.
I think their cables are a good value. No hype or gimmicks or fancy crap, just a good quality cable. If you go bulk and terminate your own, for some reason they are a bit less expensive on eBay.