i may be wrong but i think that the "normal" video cable will do a better job than a "normal" audio cable.
there is a LOT of opinions on the hype of cables,just scan the archives on this site.
when i bought alot of this system(used) i received several pairs of Straightwires level 3 reference interconnects(directional,ooohhhh!) and i have done alot of A/B comparisons and if i can even hear a difference it would never justify the cost of these cables if i had to buy them new!i've used cheap interconnects for years with no problems.if you have the option,take your cables down to the local stereo shop,ask if you can swap out the cables on their best system(if they have decent cables hooked up) and see if you can hear a difference.if you do, ask how much.the price might scare you.you won't hurt anything using video cables though.just try to keep interconnects away from power cords and speaker cables.