Of course, the mic is a very important part of great eSSB audio. No doubt about it.
However, I feel there is a point of 'diminishing returns' though - when shelling out the cash for one. Does a $2000 mic sound better than a $200 one? Yes; but the difference is narrowing rapidly when you get to the $300 to $400 range.
Radio doesn't exactly have the same standards of a recording studio. The dynamics of the airwaves can and will degrade sound performance.
The radio itself has built-in limitations in the TX filters. Everything above 5kc's is virtually lost because of the filters, and the fact that many receiving stations cannot receive that much bandwidth.
Some cheap mics can do very well after it has gone through the EQ processor. Cheaper mics just aren't as smooth as the ones that are built for studio recordings; and EQing them becomes a laborious job before they are acceptable. What we need are mics that excel in the range of 50-5000kc's. But even mics that are $400 or less can be quite amazing and do everything that one can glean from them, as far as eSSB radio is concerned.
If you have a EV RE-20, Heil PR-40, or any one of a dozen or so condenser and dynamic mics - you can already attain what you need. More focus on EQing and compressor signal processing will yield the rest. So will a hot tube mic preamp.
$2000 for a studio mic is really great to have and use; but isn't necessary for great eSSB. What distinguishes one mic from another is just how it performs for one particular individual. Recording studios have many different makes and models of mics to accommodate any person/voice that has come into the studio for a recording session. Everyone has a distinct CHARACTER in their voice; it is up to the engineer to determine what mics would best be applied to any one voice to extract the maximum tonal qualities to put to tape/disk.
One can spend a LOT of money before they find a mic that fits them like a glove. That is; if they buy and trial-and-error the process of discovery. Mics that are built for broadcast applications differ slightly from those who are singing or doing a voice-over for a commercial. These would be the Sure SM-7, EV RE-20/27, and even the Heil PR-40. Other dynamic mics would be the Shure SM-58 if on a strict budget.
Studio condenser mics are chosen for their presence, clarity, "air", punch, and lack of coloration. Choosing a mic is an art in itself which sets the best engineers as a highly paid professional. As well as his skills in making tracks for each layer of the process as flawless as possible. Tube or FET powered, as well as transformer or transformer-less makes choices even more complicated yet. There are literally THOUSANDS of possible mics to use. A simple broadcast-quality mic is enough
I sure am glad that a mic for a radio needs to be of a high quality; but not so high as to be unobtanium.
Too much info?
