For that length of cable, balanced is definitely prefered; however, if you don't have balanced in/ouputs all around, I'd just make my own cables. I'd suggest a higher gauge for that long of a run. I would buy at least 60 ft of 18 or 20 gauge silver teflon off of eBay (there are a couple sets of 500' for $100 right now, but you might be able to find 100' for the same price/ft). Just cut/prep 3 20' lengths, mark one as the conductor and braid them. You can get some decent connectors for about $3 a piece. Solder the marker wire to the center pin and the other two to the side-wall of the connector. You can even buy copper shielding if you have EMI/RFI issues. It's not too difficult and should sound somewhere in between short runs of Kimber PBJ and KCAG.
If you want that cable, but don't want to go through the effort, send me an email, and I'd be happy to make it if for the cost of the parts plus shipping. I'm positive you could make that happen for at or under your budget.