I'll bet your warm round sound will come easier from a compressor/limiter than a mic.
Try a mic through your interface preamp, then the same mic through a preamp/compression (LA2A or something)
I agree with Rob, the mics are all over the place and Im not even convinced more expensive is better at all.
Check the Sweetwater Massive Mic shootout...and download the raw samples of a few mics into your DAW tracks.
The RAW clips are unprocessed....the ones on the site have some processing.
I just posted clips of a U87 and KSM32 from there, I cant hear a difference.
Even the Behringer CO1 sounded close to the U87.imo.
I did the tube mic thing too, someone here told me it wasn't much difference and they were right.
Hardware: Even a mic > preamp> FMR RNC is a nice sound, little crisp rounded off, smoothness...professional sounding.
Software: Plugins Klanghelms are simple to use and nice, won several awards, and $free or $39 for the whole suite of 3.
that's my 2 cents...compressor ...it can make a lot of mics have that FMradio, smooth studio sound.