I need a bright detailed 300 used speaker cable

Analysis plus copper oval cables would probably have the effect you want.

JPS Labs w/rhodium spades will brighten it up.

Nordost would fit the bill, as would the others mentioned above (JPS and A Plus). I guess for $300 it would be a pair of Blue Heaven or a short pair of Red Dawn,

The AP's seem to have different effects in different systems. Some folks love the Oval 9's and some hate them. I found them very lean at the bottom end and smeared up top. The Nordost's are also somewhat lean but much more focused and cohesive sounding.

Since i'm running my mouth again, i would suggest separate runs of cables if you really want to get the best from bi-wiring. A run of Kimber 8PR or VS for the bottom and Kimber 4PR or VS for the top would give you the effects that you are looking for and be reasonably low cost. The VS is slightly smoother and not quite as bright as the PR while also costing slightly more, so depending on how "bright" you want it, you can spend more or less. Sean
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Silver or silver combos will usually give you that touch to varying degrees. Audio magic - Homegrown Audio are brighteners.