You're podcasting which means you're distributing a heavily compressed format. Depending on how you do it, I doubt you're feeding out any frequencies about 16kHz...and chances are it's rather less than that. Beyond that, your voice is unlikely to go much about 12kHz with the fundamental frequencies in a far smaller band than that.
Basically, I think you're worrying about the wrong thing. If background noise is an issue I wouldn't worry about not getting frequencies above 15k or so since you're doing voice recording only. (My advice would be different for music.)
Of the mics you list, my favourite would be the Rode NT but none of them will be what you want for stand alone voice in an untreated room. If you're that concerned about perfect sound, I wouldn't buy a USB mic at all. I go for an XLR mic and separate interface.
That's what I do. I drink and I know things.
-Tyrion Lannister (and Bobbsy)
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