Mustang V6 is a better car for daily driver status than the GT in my honest opinion.  Pick one up brand new for $5000-8000 less than a new GT.  That's about $100-150/mo less. 
 
Personally, none of those cars would be the greatest daily driver.  Volkwagen Jetta TDI.  I can't argue with 50mpg and cheaper diesel fuel along with a standard 5/60 warranty and 10/100 on the powertrain, I think. 
 
If you want performance too, the GT is your best bet.  I don't think you're gonna be able to get the WRX for under $25k, but the GT base is somewhere in the $20k neighborhood, fully loaded you can get an 02 for about $22000 with destination. 
		
	
		
		
		
		
		
		
		
		
		
	
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