Tire advice?

[ArcticSS]

Discount tire zone has 285/35/18 for 190.00 in Nt05's but no warranty unless i buy four.. Total would be around 425.00 shipped.

Discount tire direct has the same ones at 219.00 a tire. They offer a 3 year warranty for damaged or defected tires which is another $55. Total shipped will be $500 and they come with valve stems if u want to buy them. Free replacement and free shipping if they're damaged.

Not sure if i should even bother with a warranty and go the cheaper route?
I wanna change these tires soon since they rub around hard corners and dips in the road.