You could literally buy another real '71 Jazz and a '71 P Bass along with it for the price of one new CS masterbuilt (and not have to wait 3+ years). Not that MBs aren't super nice instruments, but IMO there aren't very many (if any at all) pro bassists that could tell the difference between a MB, a regular CS, and even an American Vintage series with their eyes closed. You're paying for the prestige more than anything else with a MB. They're all just wood, plastic and metal.. and a decades old design. By all means, spend your money however you see fit, but I would play some new AVRI '74 & '64 Jazzes (or the new American Geddy like the others mentioned above), and try to play a regular CS team-built '64 Jazz or something too, before you make a decision. I've owned them all and some of the AVRIs were as good or better than the CSs. A guy I did some work for a while back spent $7K on his MB and had a hard time coming to terms with the fact that he liked my $1200 used '64 AVRI better.