Kumhos give great grip and are very easy to heat but there is not a massive amount of milage with them.
I use dunlops and the grip is pretty good but it is hard to get the heat into them and they dont really start to work until a few miles in but i find there is very good mileage with them. You are talking at least €300 a pair for them (thats after pleading for ages on how you can hardly afford to go rallying)
Its a case of weighing it up... Kumhos: Great grip, not so good mileage
Dunlops: Good drip, good mileage.
Michelins??