Do what you want, AS 1 is just fine, AS 5 is better, but not "have to go out and get it immediatly" better. I still use my AS 2 and AS 3 tubes just because I have them, all work great. If you are ording something allready online, then add the AS 5 to your cart, otherwise it is not worth the shipping cost when you all-ready have a good product.