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You can try; this is a cheap one: http://www.wiggle.co.uk/lifeline-performance-brake-cable-set-shimanosram-road/
I use that on all bikes I have and works really well. Just cut right length; file down ends etc.
Funnily enough I have 3 essentially road bikes with different rim brake systems; standard 7900 DA caliper, direct mount DA 9000 and Mini V /csb
The mockup so far looks good; might be the most bling kepler build!
Just go the extra mile and get these: http://shop.donhoubicycles.com/product/barrel-adjusters
I've heard Mini V's are more powerful with Cantis more of a modulated feel but less weak.
From this pidgeon knowledge (if indeed correct) I went for Mini V's.
Would an upgraded compressionless housing make any difference? Swisscom green has always worked well for me once bed in. Got them on the Serotta with Force calipers work a treat.