NOS Super Power Shot or Nitrous Express Hitman Plus?

Kind of leaning towards the NOS 100 - 125 - 150 kit with 10 lb. bottle. The Nitrous Express kit is 50 - 100 - 150 - 200 with a 12 lb. bottle. Main concern is quality and ease of add-ons. Is there any significant difference in quality between the 2 kits? Any difference in ease of add-ons? Mainly I want a limit switch so the nitrous won't hit before a certain (programmable?) RPM and a dedicated fuel system for the nitrous. I realize the add-ons might cost as much as the basic kit.
This will be going on a 318, fresh short block, forged pistons (shooting for about 9.5 compression ration), o.o.b. Speedmaster heads, Torker II intake, and a Holley DP carb (probably a 750). Besides running forged pistons, anything else I need to do? Cast crank is OK? How much does a "nitrous cam" help? Any advice would be much appreciated.