Don't be skimppy on tires! Tires transfer power to the road and provide grip. It can make the difference between you having an acident and avoiding it so buy the best that you can afford, don't buy those cheapo stuff like Silverstone, etc. I'd rather buy used but still in good condition trusted brand of tires than those. If want rather cheap but still good enough quality, at least buy GT Radial.

+1 on used branded tyre rather then some off brand tyre
Always afford the best tyre you can buy rather then skimping on it as that is the contact patch between road and car