If you are concerned about getting enough fuel then throw in a focus pump to replace your stock pump.

Don't skimp on any safety devices. Blow Down tube, Window switch & Wide open switch at a minimum. Adding in a fuel pressure safety switch may not be a bad idea so that you don't go lean if something happens.

Call PSR up and ask about their current nitrous special. They are selling the Wilson Pro-Flow kits, which I liked the quality of when I was down at the shop last week. I'll be picking one up myself once the car is done sometime this week or next week. And as Jay said, ask them for the fitting so that you are not pulling fuel for the solenoid directly from the fuel rail.