275/60-15 tire suggestions

After having the nittos on I can't imagine myself going back to the ice skating ring... Before I put those on it felt like I was driving with butter on my back tires...

I guess they aren't as expensive as I thought they were, about 40 bucks a tire more then they coopers

I just feel like these didn't last me very long

any idea what the difference is between the NIT-180300 and the NIT 180-490?