Believe it or not, I've actually had some luck with a relatively unexpected cable - Future Sonics' Ear Monitor cable. Granted, it's not some high-end silver aftermarket cable, but I've noticed a tangible difference in sound from this on the TF10s. I recently had the opportunity to do a A-B test with a friend's TF10s on the stock cable, and I noticed that with the FS cable, the highs were brought to a less sibilant level. The mids came forward a little bit more, and lows were a slight bit more pronounced.
It costs a modest $36 from Future Sonics directly, and is your usual, Westone-style braid, with your L-shaped jack a la Westone, usual strain relief Y-junction and Westone connectors. It's available in black, clear, beige and brown, in various lengths direct from the FS online store.
For the price, it is not something to get super excited about, but is definitely a notable improvement over the stock cable, with its terrible cable memory issues and tendency to break around the memory wire portion.