Indeed, more power in a lighter vehicle = fun.
Hence why when I do a V8 swap, a 6.0L will go in vs 5.3L (unless I get a KILLER deal on a 5.3L) Or, I come into decent money and build a 427ci GM performance LSx cast iron block based motor.
The undersized rear diff and brake issue was corrected on 2006 and up models- I'm thinking about getting a Titan as well since the wife is in love with it (and she's buying!). I work with an ex Nissan Master Tech so he pretty much saw all the titan issues as they would appear...
I believe the '08s and up come stock with a tranny temp gauge as well...