Three words: Kimber Kable 8TC.
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There are several good cables out there that should be within your price range. We have compared many cables to the DH Labs Silver Sonic T-14 (www.silversonic.com), and found that the T-14 offered the best balance and overall performance of any similarly priced cable. For example, we directly compared the T-14 with the Kimber 8TC (in both bi-wire and single run configurations), and found a sweeter balance to the T-14 -the Kimber did well (easily outperforming the Monster OMC that we had previously compared to the 8TC), but was a little on the thin, dry side when compared with the T-14.
We have also found that bi-wiring does improve the sound quality significantly (i.e. bass extension and definition, soundstage depth, clarity of the vocals and in the highs, and especially in dynamics). If you want to read an online review of this cable, www.soundstage.com has one in their equipment review archives. A 25' bi-wire is within your budget and will definitely upgrade your sound quality.
I have had very good results using the Terminator 2's in my system, linking first a McCormack .5 and then an Audio Research VT100 to my Martin-Logan SL3's. I have never tried Kimber 8TC's, so I can't say how well you would do with those. I have found the built-in biwire feature of the MIT's to be easy to set up and to maintain.
I am presently running the Silver Sonic T-14 in a shotgun biwire configuration and found it to be a quantum leap from the Original Monster shotgun biwire it replaced. DH Labs also has another suppossedly similar cable (Q-10) that can be set up as internal biwire. The T-14 in a shotgun biwire should cost you about $400 new. It runs from DNA 0.5 dlx to Vandersteen 2ci.
I have been using MIT t2's Biwire for over a year while upgrading power cords and tweaking out my system. They have not let me down and am happy with them. Excellent cost performance ratio. Another option is that you might select the terminations you need if go with ICON (large or smaller )spades. In my case the Stratus Gold required the largest Icon spade to be used and standard size at amp end.
Not promoting any company but currently there's a demo pair of 20 feet bi-wired 8TC terminated with spades all around on sale at AudioAdvisor. Perhaps you could try them and see if they sound ok. I know it's a bit shorter than your requirement, but if could get around it somehow, it would offer a great value for your buck. Also, you can send them back with 30 days if they don't work. Cheers.
I am against Kimber 8tc since they have a very high capacity that is not suitable for some amplifiers + it's an addition of extra capacity into the speaker circuit that will certainly change the freequency curve. I would suggest to go for monoblocks and invest money to the long interconnects such as Audioquest Torquoise or DH Labs...
For speaker cable runs that long, your best bet is a networked deisgn such as Transparent (high$) or MIT (T2 or T3 is pretty cheap). People like us who are stuck with having to use long speaker cable runs are better off with networked designs, because they're better compensated for flatter group delay performance which is especially good for long runs compared to a non-networked cable. Just to put things in perspective, my 25' biwires are the MIT MH750 Magnum, but those list for $3800/pr. so you might not want that. BTW they make even better than that if $ aren't an issue.
One of my good friends thinks pretty highly of the LAT speaker cables. Some inexpensive ones I have used and been impressed with are: Kimber (the older, thick brown/black interleaved one - don't know the model number), Analysis plus oval 9, and, for some applications, Sumiko OCOS. I had GREAT results with the kimber and my old mg 1.6's.