I have a pair of the original First's. They DO have a natural, smooth midband, with great clarity there. I found them a little light on the bass, and rolled off in the high's. I htink it has to do with the capacitance of the carbon.
Aside from the one comment someone made regarding the First's vs. the First Ultimates, has anyone else got anything to say about it ? I'd liek to hear some definite comparison feedback.
I also have the D-102 Mk III Hybrid's. I find them a VERY nice cable, they do the frequency extremes better than the First IMO (maybe they're SLIGHTLY harsh, but not bad at all). But the First still is a clear winner in the mid's, especially vocals.
A couple Audiogon folks make some very nice cables: NotoriousBIG_PJ mentioned the Aural Thrills Gold Force. I have this as well, and can heartily concur. Even their Black Etude cable and Chrome Axiom are way cool for the $$.
The last recommendation is for cables by Audiogon user greggstraley. His name, you might be surprised to hear, is Gregg Straley

He makes a twisted pair type cable, stranded copper. He finds the cleanest plug he can (even to the point of using some cheap plastic ones, but they sounded the best of what he had tried up to that point), and he cryo's the cable, then cooks it for a week or so on a Cable Cooker.
I have had $800+ (list) interconnects in my system, this thing beat almost everything out. And it was under $100 ! Gregg now is making rev 3 of the cable, at around $120 IIRC.
The best cableI've heard in my system, though, is by Tritium. These nutcases love music, and they have funky but effective units called Triphazers. Expensive, but I won't take them out of my system. They make an RCA cable with Triphazers built in, and they also make a cable marketingly called the Ultra High Velocity (UHV). I have the UHV made with 6*9's gold wire. This is my champion, price be damned.
OK, I doth ramble. Peace, love and happiness to all...with a side of fries.