Wow, a Magnum Dynalab..... never heard one, but it seems to be amazing.
Anyway, I bought the X-PSU secondhand, and it came with 3 instead of the 4 cables suplied originally, but since I bought it for 70 dollar including the costs of sending it, I don't complain. And yes, I use these standard cables, considering it's much thicker than the cable from the original adaptor, and considering the amount of juice it transports (12 V, max. 400 mA). To me, spending more on a low voltage cable seems like overkill. You can always experiment by buying two standard connectors and some cable and make your own, but I would be very surprised if it changed the sound at all.
And you may not like to hear this, but I definitly don't like the X10-D. To my ears, it only added distortion, slowed the sound down, made the bass sound flabby and killed the stereo image. So I would improve your system by ripping out the X-10-D, but if it sounds good to your ears, keep it. You might wanna experiment with different tubes though, because the standard Philips tubes aren't the most musical around. Good luck, let me know your experiences!