Mike, here is something else to think about.
Your typical gasser gets 12mpg+ and the Diesel will get 18mpg+.
Fuel here right now is $2.39 for unleaded and $2.77 for Diesel(reader board at local station today).
Gasser = $0.1991666 per mile
Diesel = $0.153888 per mile
That is a .0452786 difference.
It will take 88,431 miles just to make up the $4000 price of the Diesel engine. Then figure in when you change the oil in a gasser it will take you 5 quarts and a filter, when you change it in a Diesel it will take 14 quarts and a expensive filter. Todays gas engines will go 100K without plugs or any other maintenance to speak of.
A very short time ago the Diesel engine made much more sense but now that Diesel costs so much more than gas I am starting to wonder. If you tow and drive massive amounts of miles the Diesel makes sense but for the occasional tow and commuting vehicle the gas rig is starting to look better. Throw in the fact that 12mpg is on the very low end and you might tighten up the gap more. 18mpg figures on the diesel is about the average and 12mpg on the gas is very low but I was trying to give the diesel all the advantage I could since I like them
You know my last vehicle purchase was a 05' F150 with the 5.4 but my 96' 7.3 will be in the family until the end of time..
Do you tow heavy?, I know you do commute a long ways so you will probably eat up that 88K miles in a hurry but this is just some food for though.
side note: I am just a truck driver so someone check my math please..