[happyhornet]

I was playing in a tourney last night, doing okay when this hand occured:

I have 4350 chips, about 50th of 80 remaining, blinds are 300/600.

On the button I am dealt Ace of spades, Q of hearts.

There are two callers before me (from middle positions) who both have me covered.

I flat call, and both the blinds play. 3000 in the pot, and the flop comes Q spades, 10spades, 7diamonds.

Everyone checks to me, I go all in for 3750.

1 caller from middle position using 60% of his chips. he turns over K5spades on the flush draw, which he naturally makes on the river!

a) Should I have gone all in pre-flop?
b) Was I a bit rash shoving all in when I did?

I'm not sure how i should have played this. Any suggestions would be invaluable.