So I am in the market for track spikes but I'm unsure on which ones to buy. My main events are the 800, 4x800, and the 1600. I'm deciding between the New Balance MD500v5, New Balance MD800v5, Saucony Ballista, and the Nike Zoom Victory 3. I am wondering how long these will last me because if im going to spend 100$ on a spike I want to have them for at least 2-3 years. If it helps in choosing I have a normal to low arch with slight pronation. My trainers are the Nike Air Zoom Structure 21. My 800m pr is 2:23 and my 1600 pr is 5:38 if that helps too.