Why the two 'i'????
The 'dealer warranty is just a name. It is called that because it is bought by the dealer on your behalf when you by the car. There is nothing stopping anyone buying the same warranty either thro the dealer or seperately. When I imported my 156, it had 1 Year Alfa warranty, and I bought a seperate two year warranty from 'warranty Holdings' who were the same people who supply the 'Dealer Warenty' to ARUK. Mine was actualy transfered to 'Car Care Plan' as WH gave up the cover. Warenty work does normaly need to be carried out at a dealer as far as I know.
Think of Warranties as just an insurance policy you are paying them to take the risk for you. Your best bet would be to shop around and try to find a good one which covers all the components, the ARUK 'Dealer Warranty only covers 'Drive Train problems'. this means that if something fails on say the rear suspension, (Like mine!!) then it isnt covered.