Questions/Recommendations for Extra Long Cable Run

Without investing in significant interior redesign, my new listening room will require me to use a very long (appx. 35') run of bi-wire speaker cable for one of my Avantgarde Duo's (the other will be a more normal length, probably 8'-10'). Will sound quality suffer noticeably when using such a long cable run? If yes, then i'm on to plan b. If no, is there general guidance you can give as to what i should be looking for, or better yet specific cables that i should consider? Or should i just find something else to worry about and pick the cable that I would have otherwise chosen for a normal length?

need one standard length (appx. 10') and one very long run (appx. 35') pair of bi-wire cables. This will be used with a pair of Avantgarde Duo's and a BAT VK-75 amp. Do you have a suggestion on what I should consider? Am I crazy for even thinking that sound quality will be ok with that long a cable? I have used T-14s and Nordost Solar Winds with this setup, and both are acceptable.