sell that minidisc on ebay and use the money to get you a JB3 and a MIDIMAN CO2...thats what I would do if I were you.....
that way you can get some decent waves and you will get source information from various mics. Then you can buy your mics based on your waves/tapes/research....
just my thoughts....JB3s are not that expensive and they will open up a world of possibilities for you....