I am currently using the Nike Zoom Victory XC 5 (cross country) spikes for my track events. I primarily care about my 400m performance, so I want the best spike that fits that. I want to get either the nike zoom rival sprint spike or nike zoom rival multi spike. I have two options, I can get the nike zoom rival sprint spike and use them for the 100-400 and then use my XC spike for the 800. Or I could just get the nike zoom rival multi to cover all my events. Which spike should I buy?