50NL: Have flush, paired board, bit confused about river action

[Chomp]

Villain horrible station donk 71/27/1, 70 hands.

I need to check on 3 things here:

1. My river bet is to get value from non-boat A's that will often check behind if I check. It's also something of a blocker because I want to see SD. Is my thinking correct here?

2. When he rr, I'm being offered 4/1 on my money. Now, when he rr me, I am almost certain the bastard has somehow filled up. But if I only need to be good 20% of the time, is that close enough that this could be Ax or a worse flush? Seems just on the boorderline to me.

3. A turn 3bet is dumb, right?

Thanks.

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Party Poker No-Limit Hold'em, $0.50 BB (5 handed) Hand History converter (http://www.learnhowtoplaypokerfree.com/convert/convert.cgi) Courtesy of PokerZion.com (http://PokerZion.com)

saw flop|<font color="#C00000">saw showdown</font>

SB ($57.80)
BB ($9.25)
UTG ($53.65)
<font color="#C00000">Hero ($50)</font>
<font color="#C00000">Button ($47.12)</font>

Preflop: Hero is MP with T/images/graemlins/diamond.gif, K/images/graemlins/diamond.gif.
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $2</font>, Button calls $2, <font color="#666666">2 folds</font>.

Flop: ($4.75) A/images/graemlins/diamond.gif, Q/images/graemlins/diamond.gif, A/images/graemlins/spade.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $3</font>, Button calls $3.

Turn: ($10.75) 4/images/graemlins/diamond.gif <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $5</font>, Hero calls $5.

River: ($20.75) 7/images/graemlins/club.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $8</font>, <font color="#CC3333">Button raises to $20</font>, Hero...

[Lego05]

I'd call. He could have any A.

[Grim Reapa]

With his stats instacall.

Id also just bet out on the turn.

[mrw8419]

I like a turn 3 bet and get the money in. A 71/21 will happily get his money in with trip aces, I really think you're ahead of his range.

[HBomb]

Given that he just called preflop and didn't reraise with something like AQ or QQ, I might consider raising on the turn in hopes to get it all in on river.. Unlikely chance he has you beat here and might even also have a smaller flush on you.