Yes, my fav at the momentNML, you've gotta love the company "Minimum" (or Minimamu), right?
i'd have to go with S1 right now too. aoi tsukasa, aoi, minami kojima, moe amatsuka, rion/shion, sonoda mion, asuka kirara. and their second tier isn't bad either...
As far as the past goes, I was really into MIllion for a while! I mean, Monbu Ran and Oikawa Nao set up the field for Tsubomi and Kanno Arisa respectively! I don't know who the new versions of those women are but I've seen a few that look like Arisa-chan and Nao-chan but no one that thow down in the bed the way they did. I don't know what happened to Oikawa Nao but Kanno Arisa is rumored to be the owner/operator of a high-end kokyu club in Tokyo.