I think you've already got a great mic there in the form of your Adonis but those BM-800's do look tempting for the cash.
As far as I can tell they are badged under many brands but are pretty much just an electret condensor type microphone, (the mic element used in them).
They seem to be marked in a couple of different version including a 48 volt Phantom type but they actually have a zener diode in them to reduce the Phantom supply voltage rather than being a higher voltage element or pre-amp design. Electret type elements need a power supply but it's way lower than those sort of voltages.
They can also be a bit 'poppy' or boom a bit on bass response and most people that have success with them add some sort of pre-emphasis circuitry, (don't panic, usually it's just a resistor/capacitor combination!) I'm not sure if all the models come with such circuitry added to them but if it helps any here's a helpful Hams solution :-
Aren't sharing Hams a great bunch.
I know our European cousins love playing with this sort of stuff and spoke to an Austrian CB station last year who happily explained his 'homemade' setup of an electret element glued into a plastic pipe then attached to a standard lamp fixing. His audio was actually amazing!
Anyway, I hope that's of some help and maybe even help for anyone else reading this now or in the future.
As more questions are posted on Charlie Tango the database grows and hopefully helps others.
All the best,