I like P90's too. Besides the MQ and the PIG90 I didn't see that much reviews on the forum, but we have descriptions on the BKP-site.
My rough idea about those four, but I don't own one of them (I will in the future):
- Blue Notes: sweet, soft, musical, open, perfect bluespickup for your 1956 Goldtop.
- Nantucket: classic P90, raw, gritty, punchy and cutting, pure rock 'n roll, but versatile enough for different styles.
- Manhattan: crystaline cleans, open, dynamic, soft in the low register, jazz, light pop, funk, maybe even some bluesstyles
- Mississippi Queen: Nantucket in hb-coat, balanced, punchy, full yet cutting, dynamic. Blues, rock, even hardrock.