The Yamaha 424 is an excellent Precision Bass variant. If you're after a different tone, a 'real' Precision Bass isn't going to be far off what you already have.
Maybe throw on a set of flatwounds, if you haven't already.
I knew it wouldn't be long before this popped up!
I'm not a fan of Disturbed, but I really don't understand the hatred for this... it's an incredible vocal performance.