For the underside of the car, you can get DOT braided lines that they use on tractor trailers. It has a black cloth braiding over the stainless metal braids. Doesn't look pretty, and it uses steel ends instead of aluminum, but it costs about 1/2 the price as the racing hose.
Personally, I wouldn't use aluminum line. Dents, work hardens, and cracks from vibration.
But, to each their own... If it works for ya, use it!