Reading big boss's comment I think the pb1000 will be my choice. In my eyes the monolith is the king sub of the 450-500 pound price point. Maybe if I move into a house in the future I will get a monolith! For now I think the scaled down sub of the pb1000 will be alright for my flat. Can always lower volume if need be. Still goes very low and 10" driver should be fine. Lot better than my bookshelves anyway and that's good enough for me! Think I'll order the pb1000 in a couple months unless I change my mind again lol. Might get my 5.1 sorted when sub arrives too have full experience