Welcome Ossy! I think this is a decision you have to make. If you've been looking and iffing for 12 months, I think you probably know what you'd prefer. If I had a choice between a baby grey or someone elses 3 year old Amazon, I'm going with the grey, but that's me. Have you ever owned a parrot before? Do you have any biting fears? Baby parrots are a huge commitment, and take up alot of your time.
What do you know about your uncles Amazon? Is it a good bird? Does he bite alot? Does he talk alot? Does he scream all the time? Is this bird something you have considered over the course of the last 12 months that you've been iffing?
We have an African Grey and a Double Yellow Head Amazon, I love them very much!! They are very different birds though, and we chose them both for specific reasons. We also have a pair of Cockatiels, and they are alot of fun too!
I probably wasn't as helpful as you would've liked, but it's really a personal preference. I sure don't regret getting Hemingway, he's my CAG, and I woudn't trade him for a million bucks!!
Lots of Luck, Valerie