You´ll buy twice. The best ist the enemy of the good....
You can use even the lousiest microphone if the situation requires exactly this sound (e.g. SM57 on guitar cabs). In other circumstances it will sound lousy, though (e.g. SM57 on violin). With improving hearing abilities and monitoring situation you´ll realize the strengths and weaknesses of your microphones, esp. if you compare them to other mics.