I looked at S3's too, several 07 plates and a 57 plate, but I wanted DSG ideally in case my mother wanted to borrow the car as im away frequently, when considering this the Eddie is really the only option as Tiptronic (AUDI name for DSG lol) versions were like 3K more for older car with more miles, this 3k difference coupled with the fact that i thought the S3 looked quite bland made me choose the Eddie, and having driven both i dont regret it, fair enuff from standing start S3 will wave goodbye to Ed30 but from 30mph up the cars felt exactly the same to me in fact eddie felt a little quicker, probably something to so with not towing around all the extra weight of 4wd!?.
For me the Ed30 looks better, nicer interior and they are less common, i have owned my Ed30 for just over 2 weeks now and i have not seen one in that time, but i have seen 4 S3's (All in black!).
Get an Ed30 but dont be fooled into paying over the odds, its a buyers market currently!! (Sorry sellers), I paid £2k less than original advertised price for mine (Admittedly he reduced it by £1k the week that viewed/bought it, but i still got another £1k knocked off!!).
Current market rates it seems would be upto 11K for poverty spec 08 plates with DSG, upto £500 more for top spec, but no higher, in fact Glass's guide puts a 08 plate DSG with ave mileage at around £12K and Cap Clean is around £11850.
I see 07 and 57 plates being advertised at £12.5 to £13K and think maybe after a month or two buyers will realise and drop the price to sell.