Ahh...Gotcha, gotcha.
Well, in that case, it's very hard to say, as I'm a fan of all the said companies (including ATLUS).
But, I'd ultimately have to go with Konami. The first gaming machine I've ever gamed on was an MSX2, and most of the games I played on it were made by Konami. I'd even argue they had the best games on that system. Games like Metal Gear, Penguin Adventure, Knightmare, Vampire Killer (Castlevania spin-off), F1-Spirit, Konami's sports games, Nemesis, Salamander...I could go on and on...
Edit: Tecmo also get a nod from me for Ninja Gaiden and Deception.
Rockstar: Announce Bully 2 already and make gamers proud!
Kojima: Come out with Project S already!