HI Narth
I have to agree with Roy, best to go for an un-abused original example, as due to age there will not be many with Audi warranty left, I would never buy a mod'd car as I do like to keep things original, however there are many on this site who have mod'd their cars and never had issues.
Have a read through the forums, there are plenty of useful posts from some very knowledgeable people, I was a member on this site way before I bought my 8P and found reading the posts very useful
Good luck with your search, what sort of budget do you have ?
Lee