I've got Soliloquy 5.3s and am very happy with Acoustic Zen Satori cables, which you may be able to find used in your price range. I know Soliloquy has used AZ cables at shows in the past, so apparently they feel there is a synergy there too. I'd also recommend auditioning their new Matrix and Silver Reference interconnects. I use the Silver Ref from CDP to pre and Matrix Ref from pre to amp and it's a yummy combo(Silver provides lots of detail and Matrix allows midrange to really sing). Best of luck.
Tim
Tim