Will I be able to find a nicely used 2007 Dodge Charger SXT for under $20,000 w/mileage under 25K?

yes you can,you can buy a new one for that much and not have to worry about it having a lot of miles on it,if you found a real good used one you could save some real good money on it because someone else has already paid for the odd charges they tack on to the original price,so if you want a used one yeas you could find one for around 16 or more at most places,good luck with your choice .