I've got a (highly modified) X-LP and my simple mods transformed it. If you want to get rid of your X-LP-S , I'll take it.
alternatively, save £ £'s:-
1) Buy another X-LPS
2) Buy the PSU
3) Open up the X-LPS
4) Re-wire all the wires you can see with decent stuff.
5) re-configure the earths
6) Junk the silly power lead from PSU to XLP and put something substantial instead
7) re-wire the PSU
Voila - cheap as chips and lots of fun !