I currently have the paradigm Monitor 5's with a CC370 and Minis for rears. I am thinking of upgrading and am looking for either a tower or bookshelf that isn't rear ported. I'm looking for more clarity at lower volume levels. My short list is Klipsch RB75 with RC-7, Axiom M60's and VP150 or the Paradigm Studio 20's with the CC-470. All of these I would go with the appropriate surround speaker. This will be for 99% Home Theater. Also with these models will I notice a "upgrade" in sound quality? By the way I have a HSU VTF2 suba nd HK525. Thanks.