I have a 2 1/2 year old female Congo African Grey. She has a huge vocabulary, picks things up on her own (which can be a problem LOL), understands context for her phrases, modifies the phrases in ways that make sense, usually, loves alternative rock music - sings with it, gives the dog commands, gets angry when he ignores her, etc - very playful, sweet, loves getting her head rubbed, loves her toys - especially the wood ones she likes to destroy. Very happy and funny bird.
Other things to consider:
If you are not getting her cage, you need a good size cage. Mine has a number of toys and perches - a good size cage is needed for that. You need a cage specifically for her size with bars spaced properly. Too close together and she can get her head caught - too far apart and she can get caught trying to get out. A good cage is a few hundred dollars. Consider cost of toys ongoing. Mine loves the toys she can destroy.
Birds are messy. While most of her poop is on the paper, she likes tearing the paper and some poop is on the floor of the cage. You need to do some cleaning and disinfecting daily, and more extensive weekly.
You need time daily to do some food and food dish prep - e.g. cleaning food dishes, warming vegetables in hot water, letting them cool. Cleaning water dish daily. Mine has 4 dishes: high quality seed and nuts (no sunflower), snacks including uncooked vegetable pasta, vegetables, water. Fruit is often a plus. Consider the food costs.
They need attention. Will you be home enough and have time to spend with her out of the cage daily? They can get bored easily. I am fortunate in that mine can keep herself occupied, is in a good location, sees the dog all day, and enjoys her music, but not sure if other birds can stay occupied.
Is there a pet store near you specializing in birds with a very knowledgeable owner? Is there a good avian vet nearby? Birds will often hide illness symptoms until too late.
There are a number of books on African Greys. Might be worth browsing.