I would say the knuckles are a good way to go for your type of track. The track I race on is very similar as what you described and I find the knuckles great. Sure, they don't hook up quite as well as komodo dragons or crime fighters, but I consider money a factor as well. Yesterday, after three 5 minute qualifiers and a 10 min main (along with some practice) my knuckles where anywhere from 25-50% gone. Now compare that to other guys running the pin-type tires and their tires are almost bald after one day of racing!