What country are you located in?
From what I understand, it is more difficult to import Mustangs into certain countries than others. For example, The Netherlands; I have heard that most people will import the Mustang into Germany, THEN have it transferred to the Netherlands as a German certified car. Do you have a plan for this?
V6 Mustangs are plentiful over here, so finding a decent one to import will not be a problem. But you may also want to have replacement parts shipped with the car, to avoid maintenance problems down the road.
Also, note that Mustangs do not have amber turn signals in the rear, if your country requires them this may be a problem. '99-'04 models can use Cobra tailights. '94-'98 and '05+ will probably need aftermarket amber lights mounted.
Impressions:
What kind of cars are you used to?
If you country has small cars with small engines like the KA, you will probably love the Mustang's power, but hate it's gas consumption. If you're used to BMW's, Audis, etc..., you may think the Mustang is underpowered for it's engine size(which it honestly is).