For a mic, I recommend AKG C3000B. It is a condenser mic so it does require 48V of phantom power. It is for $300. Before you buy, you need to try.

Concerning the monitors, I am assuming you are asking for $300 for PAIR of active monitors. I strongly suggest you increase this limit to $500. Try to get Event PS6 for that price. Do not get PS5, they are two small. Seek other suggestions.