DHC Fusion is also silver copper and works well sound wise...to be honest I did not detect a night and day difference with my Oslo II silver cable.
By the way my Oslo II is up for sale since I have balanced cables now: http://www.head-fi.org/t/698926/brand-new-beat-oslo-ii-occ-silver-cable-custom-for-spiral-ear-se5-works-with-others
I ordered the new Whiplash gold PLATED silver cable for my NT6 but also eager to try with the SE5.
Oh god, if I wasn't saving up for a dap (either X5 or DX90 apparently) I would buy them now. Anyway good luck on your sale mate, I will probably miss them but they look absolutely gorgeous.