I absolutely agree the USB Disruptor makes a nice improvement. Mine goes from a Lenovo PC to an Antelope DAC ( with it's own power supply ). So even with an expensive DAC + power supply the Disruptor improved the sound.
In my system the Regen gave more detail but less emotion, so it was returned. One Jitterbug makes a small improvement - much less than the Disruptor's positive effect. Two Jitterbugs was not better.
There are a lot of ways to improve the Computer based sound system. Try products that have a return option and have fun experimenting.
For further improvement, audition a Synergistic Research Black fuse in the DAC. You may just like what you hear. If not return it.
David Pritchard