If you skid a lot, or you have a high wear situation, there's an argument for cheap tires.

If you don't fly much, and weathering is a concern, you might want to go for better tires.

e.g. within the Goodyear line, the difference between flight custom II's and flight custom III's, among other things is Kevlar and a good bit more total mass, and I think deeper grooves for disbursing water.  III's are an extra $50 each vs. II's.

The best tires are less than a tank of gas and less than good car tires.  What grade tires would you get for your $500,000 car that goes 100mph on the asphalt?

Don't forget new tubes...

Colyn