I'll address the first question and I'm sure I am wrong (usually am) but if I'm playing in a big event then I will wait for a better spot, if it's my average buy-in within my bankroll then I will push pre-flop with AK if there has been any raise in front of me, in a regular tourney the value of a big stack early is huge IMO. 
 
If there has been no action in front of me then I will raise much more than the standard 3x and be willing to push if I get re-raised.
		 
		
		
		
		
		
		
			
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				If aces didn't get cracked they would be writing books about me!
			 
		
		
		
		
		
			
			
			
			
			
			
			
			
			
			
				
			
			
			
		 
	
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