Need Good Advice - Speaker Cable

I have an Audio Refinement Complete driving Soliloquy 5.0 monitors and a Rotel 855 CDP. I've had them a year hooked up with well seasoned original Monster Cables. The last couple of months, I've been auditioning speaker cables to get rid of some grime in the highs and some thinness to some vocals.

The system with my Monsters is actually quite pleasureable. It has a vibrant, room filling, holographic kind of quality that is very exciting even at low levels. Bass is very good and the midrange can really be wonderful with terrific tone and color to the music. Highs can be very transparent also.

I've now tried in my system Transparent Audio The Wave 100 (lifeless and veiled sounding), Analysis Plus Oval 12 (pretty good resolution and good purity, but too rolled off sounding, not exciting), Mapleshade Golden Helix (amazing stuff really, very pure high end, a bit too bright, some sibilance and some nasality to vocals). Just received and now listening to Monster Cable Z-1 (it has the expansive Monster sound that I'm used too, fair resolution, decent bass, but some grime in the midrange so far).

Almost everything has a cleaner high end than my old Monster's, but nothing is as exciting, enjoyable and colorful as they are. I was thinking of trying a low to mid priced Nordost cable next.

This business of testing cables is still fun, but I'm not sure when/where it will end. Can someone who is familiar with my experiences give me some direction?

Thanks,
Chris