i recommend Bosch leads, best on the market! recommended by a lot of tuners over here in oz!
they are the tightest wound leads on the market. they are using 4 foot of wire spun into a 1 foot lead (from what i remember) also recommend to go the msd coils.
really when it comes down to it, msd is the best on the market. if you are truly after a great running car, what i have recommended above for your ls1 will go far better then the stock ones you have on their!