33 on the button with three left $20+2

[SmileyEH]

Party Poker No-Limit Hold'em Tourney, Big Blind is t200 (3 handed)

SmileyEH (t2410)
SB (t4040)
BB (t1550)

Preflop: SmileyEH is Button with 3[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/club.gif[/img].
<font color="CC3333">SmileyEH raises to t500</font>, SB folds, BB calls t300.

Flop: (t1100) 4[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/heart.gif[/img] <font color="blue">(2 players)</font>
BB checks, SmileyEH checks.

Turn: (t1100) 4[img]/images/graemlins/spade.gif[/img] <font color="blue">(2 players)</font>
BB checks, <font color="CC3333">SmileyEH bets t1910 (All-In)</font>

First Question: Is this an automatic raise preflop, or a fold? If a raise is this (2.5xBB) a good amount?

Second: I'm fairly happy with my flop check, but should I check behind on the turn and hope to get to showdown, or is the push mandatory? My opponent was fairly straightfoward. Any and all comments welcome.