This is the second hand in a 18-man tournament, so no reads. Am I correct in pursuing this hand or did I just fall in love with my AQs?

PokerStars No-Limit Hold'em Tourney, Big Blind is t20 (9 handed) FTR converter on zerodivide.cx

CO (t1500)
Button (t1520)
SB (t1480)
BB (t1500)
UTG (t1500)
UTG+1 =#A500AF(Villain)/ (t1500)
MP1 (t1500)
Hero (t1500)
MP3 (t1500)

Preflop: Hero is MP2 with Q, A.
UTG raises to t40, UTG+1 =#A500AF(Villain)/ calls t40, 1 fold, Hero calls t40, 4 folds, BB calls t20.

Flop: (t170) 7, Q, 3 (4 players)
BB checks, UTG checks, Villain bets t100, Hero raises to t200, BB folds, UTG folds, Villain calls t100.

Thought I would see how committed he is to his hand, and I'd probably fold to a reraise. Should I just call this early in the tourney and not risk my chips?

Turn: (t570) A (2 players)
Villain bets t200, Hero raises to t400, Villain calls t200.

Figured at this point I have him beat. Should I raise more or, again, be cautious this early?

River: (t1370) K (2 players)
Villain bets t200, Hero calls t200.

Final Pot: t1770

Thanks for any advice. BTW, I came in third in the tourney (my first time playing on PS). I should have done better, since I was chip leader by a sizable margin at one point, but my big stack play needs work. I don't get to practice it much