250k ought to be enough, but if it isn't i think you should
abandon the idea. is your budget inclusive of first year insurance
and road tax?
depending on your age, driving experience and insurance policy,
insurance might sap a good portion of your budget. i'm 23 and was
quoted over 8k annual premium for my car, premium for the gallardo
is around 25k, mustang for you should fall somewhere in between if
you're around my age. road tax should be around 6k for the
mustang's V8.
lastly, if i were you, i'd spare myself the trouble and just
appoint a parallel importer to do the legwork for me. they'll
probably charge you fees of 5k-10k. even better, tell regent motors
your budget and see if they'll import it for you, that way, you'll
enjoy agent servicing and the benefits of the warranty.
again, good luck. remember to post pictures when the car
arrives.