I used an Ensemble Powerflux FSF, which might just come in under your limit, if you can find one. It made a big difference in my system at the time. Here are my notes :
-better detail across the spectrum
-bottom end detail, definition, body and control. A big difference here.
-smoother highs and a reduction in high frequency digital artifacts
-harmonies are better defined and more agreeable
-voices are more natural, throat and breath sounds more recognizable
-the soundstage is fuller and more dimensional
-digital sources have noticeably more detail. Digital becomes more interesting and satisfying at lower levels.
Happy hunting!
-better detail across the spectrum
-bottom end detail, definition, body and control. A big difference here.
-smoother highs and a reduction in high frequency digital artifacts
-harmonies are better defined and more agreeable
-voices are more natural, throat and breath sounds more recognizable
-the soundstage is fuller and more dimensional
-digital sources have noticeably more detail. Digital becomes more interesting and satisfying at lower levels.
Happy hunting!