I recommend that you don't look at aluminum alloy rods for a street car. Although aluminum rods can be used for a drag car, aluminum will slowly elongate under tension. This makes it a poor choice for a street engine that has to last 50K miles or longer. Aluminum rods are fine for drag racing or track use where the engines are rebuilt every 1000 miles or less.
Composite aluminum rods using silicon carbide or other fibers to overcome the elongation and fatigue problems are very expensive. Titaniun rods would work but are evn more expensive.
For street use, forged alloy (4340, etc.) steel rods are a cost effective upgrade to cast or powder cast iron rods. A forged alloy steel billet rod offers 30% or more strength to weight improvement after shot peening and heat treating.
Combined with a better rod design, an alloy steel rod can provide twice the strength of stock rods at approximately twice the cost of stock rods. The alloy steel rods have the elongation and fatigue behavior that should allow them to live 100K miles or longer on the street.