5.1 system for Tasty bass...

Hi all...
I want a 5.1 system for my PC
(Intel Media edition DG45ID on-board soundcard,IDT based)

currently have T6100 and it's bass is very boomy..

budget: <7K ..or little more for tasty bass

usage:

1.Music
2.Music
3.Movies

I love rich realistic bass...

and your openion about these..
F&D F6000,Logitech z506 and Edifier DA5000..pls