whoaa the sw so BIG!! you must be really enjoying the bass!

My house got space for it. You can use my house as your storeroom 

What speaker is that? I woudnt recommend so near ur pc as the magnetic field might corrupt ur hdd.

How much does that set costs? How is the sound compare to Z5500 (stereo mode to be fair)

I still think its a bad idea for so close to cpu. Are you sure the sub is magnetically shielded? Or just the sats.

S730 Features:

    * Heavy metal 2.1 speaker system with 10 inch subwoofer
    * Wooden MDF housing for all speakers
    * 2-way satellite in piano finished wooden housing
    * Passive radiator on both sides on the subwoofer to exaggerate bass performance
    * Magnetically shielded drivers for all speakers 
    * Switchable analog/digital input ports for most kinds of audio source
    * Multifunctional wire controller with 2.5 inch LCD display (dimmer included)
    * Headphone output on wired remote controller
    * Master volume controls both speaker output and headphone output
    * Volume booster for extra power output
    * Separate bass and treble adjustments
    * Multifunctional wireless remote controller included

Buy 2ndhand X-Fi, then use digital lor... I got X-Fi but Amp only analog... really bad setup....

Did you guy know about this:
Auidogates sales

Why do you want to use optical if you got such a nice card? If not mistaken, optical bypasses all the opamp and dac giveing u the same signal as onboard optical out.