I recommend deleting "+rep" from your post because their rules strictly forbid verbally offering Rep for help. They say that it's "rep abuse". Another reason is, it makes it look like anyone who replies is only replying to get a Rep+ out of you.
Anyway, as an owner of the VS4121 system, I can say that if you have a good sound card or other device (i.e. not onboard audio), then you will be very happy with this system. You have a treble knob, a bass knob, a very clear sound after adjusting Graphic EQ settings, great low end thanks to a wooden subwoofer cabinet and a very attractive physical appearance.
I haven't owned or tried the X-530 system yet, but I'm not seeing a treble knob. That comes in handy.
However, this reviewer seems to like the X-530 system:
Edited by TwoCables - 4/3/14 at 1:21pm