From past experience of importing cars i would not have a problem going down this road.
I saved about 18k when i bought an S3 and a TT roadster and had no problems when i came to sell them on,in fact i made a £500 profit on the S3 after running it for 18 months.
Fair enough you will have to knock the price down slightly in comparison to a UK supplied car,but if you are saving a whack when you buy the car it works out about the same if you buy it through an Audi dealer.
Plus there is the added benefit of upsetting the local dealer when you turn up to have the car serviced etc

Cheers fc
ps the TTR was for the girlfriend......and it was <beep>!!