Buy used. That way you can try them and if they don't work you can turn around and sell them at little or no loss, assuming you stick with brands that have a good following. It would be helpful to know what you're using now and what areas youre looking to improve upon.
All that said, a pretty safe bet is a pair of Acoustic Zen Satori or Hologram cables. Well within your budget used and just great all-around cables that do a whole lot right. To my ears they walk that line of sounding very musical yet are still very detailed so you don't feel your missing anything, and soundstaging and imaging are very good. The result is a very organic and natural sounding cable. Hope this helps and best of luck.
All that said, a pretty safe bet is a pair of Acoustic Zen Satori or Hologram cables. Well within your budget used and just great all-around cables that do a whole lot right. To my ears they walk that line of sounding very musical yet are still very detailed so you don't feel your missing anything, and soundstaging and imaging are very good. The result is a very organic and natural sounding cable. Hope this helps and best of luck.