I have a wonderful student who is really into Garcia Fons. He (the student) used to be a fine cellist and has tremendous bow technique. He's playing a cheap bass now, but is really interested in eventually getting a 5 string with a high C. I've played one once, and while I wasn't too thrilled with the bass, I loved the whole high C aspect, and may think about this for the future as well. I know these are relatively rare, but was wondering about a few issues. - Are basses built for either a high C or a low B, or are they only converted when the owner desires? - Would many/most luthiers generally be amenable to building and/or converting one of their basses to this configuration? - Could something like a LaScala (not mine, but maybe a new one) be converted to an effective 5 string, or would it need to be designed as such to really be optimal? - How many high C strings are even available on the market to choose from? Any other questions/related issues welcome.