Since mag swaps are so easy in P-90's, you can take the Duncan line and significantly expand it, including using two different magnets in the same P-90. I have SP90-2's and SP90-3's; pulled out the ceramic mags and put in alnicos. One of my favorite combinations is an A8/A4 in the bridge for a warm beefy tone, and an A5/A4 in the neck for a little more midrange and less bass than twin A5's.