Interesting situation i ran into preflop

[thabadguy]

5-5 500 cap really loose passive game with one good player(villain)
villain has like 630 or so, i have him covered
utg makes it 25 blind, 3 callers to villain in co who makes it 130 total.
I have AJs on the button and make it 200 more
He pushes all in.
I know my reraise in this hand is not very good because of his stack, he pushes i have to call.
But me and azk were discussing if it would be a good move
if he has like 1k behind, in such a case i think i like the reraise.
I thought he was trying to pick up the limpers money, hence i reraised..comments?