Which nitrous kit?

I recently installed the fitech 600 power adder, I was planning on installing a nitrous setup this winter but like a child waiting for Christmas......
Anyone have any advice on what kits are good/ bad. I'm looking for 100-150 shot.
And a dumb question, I'm assuming I would be able to use the exsisting fuel line supplying the fitech but would have to add a regulator to drop the pressure to the n2o selonoid ?