xm8500 + xm2000

[mtrmasuko]

hi,
im really short on budget.
i need 2 mics for fx recording. im considering these 2 mics but should i buy;

2 xm2000 ?
2 xm8500 ?
or 1 xm8500 + 1 xm2000

actually i dont know much about mics & no idea about the differences between these two.

please share your experiences.
thank you.