I had Retro-dlx in mine Marcus-IV for couple shows...yes it's great preamp lot of options but I think I like OBP-3/ OBP-1 little more becouse it does not sound "too active". Anyway if I'll have this bass with retro preamp I'll keep it with Retro-preamp!

I had DiMarzio UJ in mine for year (?), I had Nordstrand SC (not happy), Antiquities II, SJB's-1, I was happy with SJB's...I think Aero pickups will work great too...maybe try some CS Fender's...