The bass that I am getting custom made for me is a Pavel. Pavel De La Fuente makes killer basses, whose company specializes in custom orders.
My Pavel that is getting made for me is a 5 string Jazz bass, Cocobolo top, Mohogany core, set neck(not a bolt on), birds eye maple neck and board, and some killing bartolini jazz custom pickups. I got this bass totally to my specs, and everything I could ever want from a bass is going into it. even down to a custom shaped neck. And after all that, (and a ton of searching around), Pavel gave me more bass for the $. Pavel is a definite way to go.
Also. there are some companies out there that make custom basses for $30,000.... Most ALL customs don't cost near that much. You can get a custom bass, with your dream bass sound, and all your specs for $3,000, and many different luthiers can do this for you. But remember: money shouldn't necessarily be the deciding factor in choosing a custom bass. I went with a Custom Pavel to get the perfect tone, feel, and playability possible. If you go custom, you should think about what the perfect tone and feel is for you. And you tell the luthier what you want out of a bass. And If the Luthier is worthy, will build you the perfect bass, with all your specs and tonal needs. they often come with sweet "easter eggs" that the builder will use in the bass.
Also. what I love about customs is that you get a perfect bass made for you, that will be with you for many, many years. I know that my Pavel bass will most likely be the last big investment in a bass that I will ever make. not because buying basses is difficult, but because this bass will suit me perfectly in every situation, and every style that I will ever play. to me, THAT is the beauty of customs.
www.pavelmi.com