Are you looking to purchase for any particular reason?
The factorty B.O.V is one the of the best you can use on the Caldina unless you are changing your turbo, manifold setup and are putting out large amounts of HP. You may also find some of the lower end BOV's on the market may cause boost problems, I am sure somone will correct me if I am wrong on this.......
If you are just purchasing for the sound, fair enough. It's one of the joys of modifying your car, there's an endless supply of upgrades you can do!
I think the HKS SSQ BOV may have the release you are after, I found the below link which may be of some assistance.
http://www.blowoffvalves.com/