Or buy a Black Dog!
:D
But seriously, ask Tim, and state exactly what you like/don't like about the PAF Pro. If there's nothing you didn't like about the PAF Pro, then stick with it, as Philly said!
Changing to a Nailbomb is almost certainly a mistake, in my opinion. It's higher output than a PAF Pro, and will probably be too much for you. My inclination is to suggest looking more in depth at the Vintage Hot range (Black Dog, VHII, etc) rather than the 'contemporary' pickups.
But the best possible advice, if you're dead set on buying another BKP to replace the PAF Pro in the bridge, is to *telephone* Tim and speak to him about it! He's incredibly helpful!
Roo