Zex is the best for the money. You are an idiot if you buy the Venom kit just to spray anything less than a 100 shot, and even then I wouldn't dish the dough, it's overkill protection. N20 is harmless, the 2JZ will handle a 75 shot ALL DAY no problem. Just make sure your injectors are clean as a whistle and your Fuel Injections system pressure is good and high (which the Zex does for you and adjusts N20 accordingly).
Have fun with it!
