Help With Nitrous Kits for EFI/TBI 305

[colt45-2007]

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Ok I have an 88 C1500 with a fairly new crate 305, it has 32,000 miles on it as of now, its pretty much stock, It has a K&N cold air intake kit, new exhaust from the manifolds back and sum other little stuff but nothing major. I am seriously thinking of buying a nitrous kit for it and am wondering what kit would work best or if I should even buy one at all..... A couple of kits I'm looking at are as followed:

ZEX Truck EFI Wet Nitrous Oxide System 82047 Kit with 55-125hp jets and activates using throttle position sensor.....(highest rated kit)

NOS 8 Cylinder Sniper WET EFI Nitrous 07006 Kit with 75-125hp jets and activates using micro switch near throttle linkage....(cheapest kit)

JEGS Barry Grant Adjustable TBI Nitrous Kit 87-95 with 50-125hp jets......

NOS 88-95 Nitrous Kit, Wet Shot Plate System For TBI Trucks 100-150 HP Adjustable - 4.3/5.0/5.7L......(most expensive kit)

All kits state they are for stock or slightly modified engines and require 92+ grade gasoline and a fuel pump meeting NEW specs..... I already run premium gas and have already replaced the fuel pump with a new one so I feel as though I could run any of these kits without any problems...... Please give me your opinions and feedback on the subject, Thanks