anyone know if these tires are any good: Kumho ECSTA ASX.
they are relatively inexpensive and they appear ok
also, what about Pirrelli P-Zero Nero M+S?

Both of those are at the top of the Ultra-high Performance All Season tire category in our testing here. I thought both did very well against the other tires in that tire group. Both offer very good steering response and braking in the wet and dry. I did think the Pirelli was a bit quicker in transition and turned slightly faster laps on our test track in the dry. I found the Kumho to be just slightly better for ride comfort and road noise on the road portion of the test. Both are close in performance and would be a good buy.