V6: 236hp
4.7L V8: 276hp
5.7L V8: 381hp
if you opt for the 4.7liter i recommend you look for the 4.6 instead. it's rated at 310hp with better mpg.
http://www.cardealercheck.com/
you can check that website out for reviews, but of all you listed i've heard great reviews for hollywood toyota.
i'd deal with their internet fleet sales and get price quotes from each dealership. whoever gives you the lowest price ask the other dealers if they can beat it. you can also check newspapers on saturdays as dealers will bombard it with ads.
btw,

to TN!