The late president of the Sacramento L5 Society stated that the best combo generally available for the amateur high-powered rocket builder is seven parts hydrogen peroxide (a monopropellant but used here as the oxidizer) to one part kerosene. Never met him, but I really liked that guy. He was planning a regeneratively cooled engine using this chemical combo when he, uh, had his fatal accident.
I was thinking the same thing. Hydrogen peroxide is cheap.