Best hpop
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Keep in mind you will be going from AD split shots to stage 2 single shots...Stock AD's are super oil hungry so if the HPOP holds pressure, running single shots and you might be alright with the stock HPOP. If it does need more oil a good inexpensive choice is the TE modded pump or one of the other pumps i mentioned.
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He is right, an aftermarket pump is good. But you don't need it right now... If you want to spend your money, go for it. If your HPOP is functional and holds pressure the way it is, run it.