Just buy one algo at a time, starting with the ones that you would need to have the soonest. I only have 4 algos so far on my core, but will buy more to get where I'd eventually like to be, little by little.
I have only been on the H9 platform for two months, so it's kinda early to assertively recommend any specific algos, especially as I don't use my H9 as a guitar effect..
