Right now for me there is no diesel option - I'm planning to buy new (2009) and will not wait for the new 2010 diesel offering - so 5.4 3-valve is my plan. My towing is not as frequent as before (maybe one event a month) and I'm not travelling as far. I want this as my daily driver too.

So back to the question at hand - 3.73's or 4.10's?