I agree with what you said about the Sport Trac. Is it a Truc, or is it an SUV? Personally, I think it's an SUV that dreams of being a Truck.
Honestly, I'd love a 4-door Ranger. Right now, I have a 2003 Regular Cab Ranger Edge and if I had the ability to trade up to a Ranger with 4-doors I'd be at the dealers immediately!
My little Ranger has been great. Even with the gutless 3.0L Vulcan, I've been able to haul loads loads cement bags (20 * 60lbs = 1200lbs) from Home Depot to home with no problems. I've hauled furniture, appliances, etc. It's been a great, little truck. The only thing I would want more out of my Ranger is power and fuel economy. Other than that, it's great. Sure, the 3.0L Vulcan is gutless but it fires up quick everytime I turn that key. It might not be powerfull, but it sure is reliable. For that reason alone, I think the Vulcan is great. I'd take reliability over a tire screecher if I had to choose one quality out of the two.
For all of those reasons, I would buy another Ranger but only if it has 4-doors, the same reliability (if not more), and more power. I guess until then I guess I'm stuck driving a Regular Cab for awhile, which isn't so bad really other than the lack of tire burning power (gotta remind myself it's not a race truck), room and passenger space.
It would be pretty great if they sort of unified the Explorer/Ranger once again (no, and not like the Sport Trac) so that most the parts are interchangeable (saves money for Ford, and us) and so that they have similar styling. Here, take a look at this link:
http://www.rangerpowersports.com/features/?p=8
I think someone had the same day-dream that I had. Look that that photoshoped picture. It's an Explorer front end, with an F150 rear-end. I really like the squared off bed rails of the F150. I wish the Ranger had that. Anyway, the imaginary Ranger in that image looks beautiful! That's something I'd definately buy!
As far as the diesel goes. A 4 cylinder turbo-charged diesel would be great. They have them in other countries. I know that International has a 2.8L diesel engine. It a 4-banger diesel can be put in there that put out around 300lbs of torque then I think it would be a winning combination.
Anyway, that's my 2 cents for all it's worth.
Joe