When I bought my brakes from Kore3, Tobin suggest the CuNiFer lines. I owe this guy a pack of beers!
I have all the flaring tools and such. Very easy to do. I bought my lines from AAS on Amazon. No issues what so ever.
http://www.amazon.com/AAS-Copper-Nic...ywords=cunifer
http://www.amazon.com/AAS-Copper-Nic...ywords=cunifer
I have 3/16 left for just in case. On the 3/8 I have enough left to make my trans cooler lines as well.
Again,
Tobin