getting all in with TPTK

[catlover]

UTG is an aggressive player.

No-Limit Hold'em, $6 BB Hero (6 max, 4 handed) FTR converter on zerodivide.cx

SB ($2319.15)
Hero ($688.35)
UTG ($704.10)
Button ($1275.58)

Preflop: Hero is BB with A[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/club.gif[/img]. SB posts a blind of $3.
<font color="#CC3333">UTG raises to $18</font>, <font color="#666666">2 folds</font>, Hero calls $12.

Flop: ($39) 9[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">UTG bets $22</font>, <font color="#CC3333">Hero raises to $100</font>, UTG calls $78.

Flop: having concealed the strength of my hand preflop, the top pair gives me a much stronger hand than my opponent is likely to expect. Combine this with the fact that he is aggressive, and I am already thinking about getting all in. If the turn is a scare card [a heart, or maybe Q/J/T], it might slow me down.

Turn: ($239) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font> <font color="#CC3333">Hero bets $325</font>, <font color="#CC3333">UTG pushes</font>, Hero calls.

Turn: it was not a scare card. I know my hand is not the nuts, but I am still thinking I want to be all in here.
However effective stack is still a little over 2x the pot, so I settle for a mild overbet.

****

What do you think of my thought process? Is my hand good enough to take a stand like I did, given that my opponent is aggressive?

Given that I decided to take a stand, what about the way I went about it?