Mezz offers a very high end series, but they are all models that are repeated. Adam has a custom line called Musashi that is basically another high end line of cues, however you can have a Musashi tailor made to your specs.
Jun Shimizu heads up a shop that makes Keith/Andy Custom cues inspired by Juns admiration for his favorite two cue makers Keith Josey and Andy Gilbert. He makes a great cue, but they are priced to sell in Japan which means you can get the same quality and most likely a more valuable name with another custom cue maker.
There is another custom cue maker that makes cues and deals them through TCCP but I can't seem to remember his name.
dave