I was looking into this last year for a similar setup. The lower end logitech ie z506 does not have optical input. Only logitech one that has that is the z5500's which will cost you $$$. NCIX still sells those for $400.
What I did was get a logitech 5.1 game console adapter. You can find those on amazon or google. Its not true surround but will get sound to all your speakers. I think I also have additional splitters/cable connected so that my ps3 and pc is can use the speakers without having to replug cables from ps3/pc everytime. I think that's what I did last year, havn't looked in the back of my pc/ps3 in a while lol.
Ps, NCIX has the edifier s330d 2.1 speakers that have optical input for 100ish, but its only 2.1 but should be much better than the x540 anyway
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