12hp1020 vs 12fx600

They are all fairly similar on paper and I wouldn't expect big differences in practice. I would go for the least expensive between the three. You might consider Oberton as well. Might get more bang for the buck.

12NB601

The only real way to know is to build a test box and throw power to them. Might want to try pa-forum.de or speakerplans.com for more hands on experience with this application.
 
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