I dint understand the worry about a cable running the length of the top tube. It's a couple cables...they don't have razors on em and ththeyove a couple of centimeters at most due to tension.
I've ridden bikes with the cables placed there and never thought twice once riding. If I need to jump off a bike, there is 0 chance I get pinched by cables that can move laterally.

Anyways, here is an option.
Disc brakes, great components, slack geometry, can hahandlwider tires. http://www.amazon.com/Diamondback-Bi.../dp/B00OHD6N9S

It sells at rei, performance, and other places too.