Aggressor Fleet still manages Jardines Aggressor I and II, located in Zapata (Jardines Aggressor 1) or Gardens of the Queen (Jardines Aggressor II). Additionally, they manage my old boat, Spree, now called M/V Oceans for Youth.
All Star Liveaboards manages Jardines Avalon II, Jardines Avalon III, and Jardines Avalon IV, all at Gardens of the Queen. From their website, it looks like you don't pick your boat, you pick the trip and they fill whatever boat is available/needs passengers. Gardens is all tender diving anyway, so the boat doesn't really matter, it;s just a place to sleep and eat.