I have certs from NSCA and NASM. I'd recommend both... I think they actually compliment each other nicely. That said though, they certainly aren't the be-all-end-all to knowing everything there is to know about training and the sciences dealing with the human body. No certification gives you that.
I don't have the ACSM so I can't comment specifically. My partner has the HFI cert from them, but I never really delved into it with him.
Are you planning on training at a gym? If so, I would suggest contacting the gyms you had in mind and asking who they like their trainers to be certified by.
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