Get the AmStd P Bass and sell your MIM P... then buy a MIM Jazz.
but I like to do things the hard way. 
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The worst thing you can do is run to a store and buy something on a whim. If you decide to purchase new, try not to buy something the first time out.
In other words, play some guitars (make sure to us the same amp/same settings), make a note of the ones you really liked, go home and let everything soak in, then go back to the store after a few days and see if you still like your choices from before (again, using the same amp and settings).

...G&L Tribute L-2500, a brilliant active 5 string...
If you like your current P bass I would keep it and just upgrade the pick ups.
62 Reissue Custom shop strike a great balance of tones but there are many other options.
