Greetings :)
What 'bucker do you have in the bridge? The stock Burstbucker 3?
If so, I'd say a regular P-90 would be your best bet. The BB3 has a vintage output and an Alnico II magnet, as does the BKP90. The hotter P90s probably won't balance well with the humbucker, and they use Alnico V magnets which will give a different tonality.