Coincidence.
I just sold some cables, and will be waiting a few weeks for the new ones to arrive. In the meantime I had some old Audioquest type 4 cable laying around. So I hooked it up. While not terrible (not offensive), it certainly is a pretty flat, dull cable, with little in the way of detail.
You might try Kimber 4tc shotgun or 8tc. Both will be a significant improvement over what you have and should fall in your budget. Another great value is Acoustic Zen Satori cable which can be had used for around your budget.