I need some advice if you would be so kind, i plan on using this unit for recording concerts which would be better. Now keep in mind i have a pre-amp and the mics i need a md my md just died =\ which would be the best for me. I only need this for once in a while recording therefore dont want to spend a fortune thank you guys in advance for your help. so which is best value? mz707 for 149.99 mxr70 for 129.99 mzn710 for 149.99