I'm not sure if it will do the sound you want (personally I think the P fretless sounds much nicer than the J fretless), but a decent second-hand Yamaha RBX200F will be a fine bass, not too heavy and not expensive - £120 or so? I've got one, and it is definitely not for sale.
Also, I recommend Aria Sinsonido 690FL. Looks cool, sounds lovely (though perhaps not very Pino?), weighs very little.