I thought the A4 was close to being like the A1080?
But still the A1080 is better than the A2. So if it's a straight trade at no-cost, I would take the A1080 over the A2.
So to recap - you got the A1080, then sold it to your son. Then got the A4, then sold it to your son again.
Then now you're down to the A2.
You're gonna have to find a way to the A3080 or A6 or A8.