Take your pick, any of the vendors on this site can get it for you.
STM
Extreme PSI
MAP
JNZ
Strictly
Punishment
By the way it's a braided stainless steel line from the master cylinder to the slave.
I have this in all my DD and really like them
http://www.rockauto.com/en/moreinfo.php?pk=6105492&cc=1205873&jsn=356
My GSX has different brakes but for a daily driver they are perfect and cost a little more than the ebay ones.
I also have the two piece Baer eradispeed and I think are around 14 pounds each, vr4 calipers which are considerable lighter than evo brembos and I made my own bracket from aluminum instead of the heavy steel that came from rtm. I'm really satisfied and in my opinion was the best choice...