[tommygunne]

If you honestly thought you would get 1 or 2 callers for $20 then its not too bad... But basically your stack is comittted once the flop comes round as you only have 2.5 times the pot in your stack.
Preflop just make it $10 or $12 though.
Flop: You should be looking for the best way to get your remaining $150 in. A much easier way would be to bet more on the flop and so not have to overbet the turn.
Just make it 45/50 on the flop. This leaves you with 105/110 to get into a 164 pot.
You should always be planning ahead to find the best and earliest way to get all your chips in the middle in situations like this.