Speaker cables or interconnects??


Speakers: Spendor A6
Amp: Musical Fidelity M6i integrated
CD: Cambridge Audio azur C350
Turntable: Pro-ject Xpressions III
Cables: Audioquest Evergreen interconnects, Monster XP speaker wire

The Monster Cable sounds pretty good but highs are a little bright and mids slightly forward. I've tried DH Labs T14 and Blue Jean Cable and the DH sounded a little bright and "thin". The Blue Jeans Cable highs were smooth but the mids were a bit recessed.

Here's my question ......would I be better off keeping the interconnects consistent and trying to adjust via speaker cable? That's my current thinking. Any suggestions on a step up speaker cable that is just plain flat. Any guidance on the Cardas "Neutral" speaker cables. Any other recommendations, thoughts or suggestions are appreciated.
mmt
The Material of the contact area has a huge influence of information transfer (AES Standard). Normally the RCA connectors in your units are hardly more than 6.95$ per pair (Silver ones for example are 100$ and you can hear the difference at once...). Have my doubts, that an expensive cable will make much sense. It will change something of course, but you can roll the dice with your next unit again...
Very happy with Mapleshade speaker cables, never tried the IC's. Highly recommend the lower priced Transparent cables; speaker, IC, power cords.
I've used XP wire in budget systems but would upgrade asap considering the associated equipment you're enjoying. If you're thinking of an upgrade but within a spartan budget, I'd try Kimber Kable PR or entry level QED. (HiFi Cables from the UK for the Qed.) I'm very pleased w/both the cables I've mentioned especially for the low cost.
Thanks for all the responses. I've read as much as I can stand about technology and reviews and the Acoustic Zen Satori right now is #1 on the list. Even their technology page makes sense to me. Some people say there is very little difference in speaker cable, but I put the DH Labs in and listened for less than a minute and disconnected them. From that moment, I discounted anything with silver content. I just have to take a deep breath and let loose for the Zen. Never spent that much on cable before.
I have a pair of 25 foot blue jeans cables (10 gauge) with bananas cold welded. I did a back to back comparison with a pair of 7 foot audioquest rocket 44's. Couldn't get the rocket's to stay in my amp very well at all and I actually preferred the sound of the blue jeans cables. I do like audioquest interconnects though and am using a pair of Diamond back rca's and will buy a pair of diamond back xlr's to replace a pair of monster interconnects when I have the money.