Hey guys, so we're in the money first couple hands at this new table

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PokerStars Hand #120428501803: Tournament #954588595, $5.00+$0.50 USD Hold'em No Limit - Level XIV (800/1600) - 2014/08/21 21:40:48 ET
Table '954588595 49' 9-max Seat #4 is the button
Seat 2: myground (50675 in chips)
Seat 3: pk420 (17482 in chips)
Seat 4: HERO (93087 in chips)
Seat 5: cihanlwd (18934 in chips)
Seat 6: perfect guim (87339 in chips)
Seat 7: franco8595 (48956 in chips)
Seat 8: kryking (57222 in chips)
Seat 9: Stanley440 (71906 in chips)
myground: posts the ante 150
pk420: posts the ante 150
HERO: posts the ante 150
cihanlwd: posts the ante 150
perfect guim: posts the ante 150
franco8595: posts the ante 150
kryking: posts the ante 150
Stanley440: posts the ante 150
cihanlwd: posts small blind 800
perfect guim: posts big blind 1600
*** HOLE CARDS ***
Dealt to HERO [Ac As]
franco8595: folds
kryking: raises 2479 to 4079
Stanley440: folds
myground: folds
pk420: folds
HERO: calls 4079
cihanlwd: folds
perfect guim: folds
*** FLOP *** [7h Kh Js]
kryking: bets 8818
HERO: calls 8818
*** TURN *** [7h Kh Js] [Qs]
kryking: checks
HERO: bets 8000
kryking: calls 8000
*** RIVER *** [7h Kh Js Qs] [Qh]
???

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my thought process pre flop was that his raise size was somewhat large for this stage of the tournament though i had just moved not sure if it was his pattern, but i figured his size was somewhat of a middle pair or AT/AJ and I wanted to keep him in the pot n not scare him away with a 3bet, maybe i should have 3bet tiny but as it played out how would you guys have played the hand? thanks