I use a Muse, cost about £15 from a UK supplier on eBay, I think more expensive higher spec versions are also available, cost less than a good Ixos 1.5m long cable. It's USB powered, has SPDIF coax, Toslink mini, and 3.5mm headphone out (no volume control) all in a unit about the size of a matchbox. If you get one and then move on you have a reasonable headphone amp for you laptop.