Alex's can make great pets - I had one for 15yrs before it succumbed to cancer.
Gotta say though, if you're thinking of getting a bird for it's talking ability then perhaps you shouldn't get a bird.
Alex's can be great mimics, but it really comes down to the individual bird. You might end up with one that doesn't say a word. They're a very intelligent bird that can be taught a lot of clever behaviors, that includes playing. Typically not a species that enjoys cuddling or being touched, and Asiatics do require a lot of one on one time to maintain their tameness.
ALL male parrots, when sexually mature, tend to be protective of their perceived partner - that often comes off as 'aggressive' behavior. Females can be the same, but usually to a lesser extent.
Good luck, and keep researching!!