Thats a lot of speaker cable. Does your pre and amp have XLR outputs and inputs? If possible, relocating your amp closer to the speakers and running balanced between amp and pre may be a better option. Mogami XLR mic cables are quite reasonable.
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With respect to Eric and Mrderrick, I think the OP made it clear he can't relocate his amp.
I'm no speaker cable expert, but I believe that over such a long run, resistance is your biggest enemy. Using the heavy gauge Monster is a good idea, but it may even be worth thinking laterally and investigating stores that sell equipment for PA and concert gear. Speaker cables at live shows often have to run over 100 feet and still maintain quality (audiophile quality I don't know); you may find they sell quality copper in heavier gauge than any hifi store might stock.
Just a thought...
According to this, it's all about wire gauge, distance, and speaker impedance.
If you choose to believe it, then Monoprice has some of the best prices for speaker wire. If you need 10 gauge, I recommend Blue Jeans Cable.
For my odd 25 foot situation, the Cable Co has recommended either bulk DH Labs Q10 or Vampire SPII (discontinued). They have never steered me wrong, albeit these are (or in the case of the VPI . . . were) the two larger gauge cables that they sold).
Any opinions on bulk supply alternatives? For my use, Plinius 9200 w/ Tyler Acoustics monitors/sub.