At the minute £5 - 6,000 will get you a very nice S4 ( or an absolutely mint S2).
Manual cars are very difficult to come by as about 85% of production was Auto but don't be put off by the auto option. It works very well with the 4.7 or 5.0 engine and the Mercedes auto transmission. You can be lazy around town with it in "D" but out on the open road you can shift the selector and drive the car like a manual. Keep the revs up and you can have a lot of fun
If you are really serious I would recommend you take a look at
http://www.928.org.uk which is dedicated to the model. There is an email list you can join so that you can ask lots of questions before making a decision. As with any Porsche the trick is to take your time, do your homework and find a good car that has been properly maintained.
I'm into my 5th year of ownership and still have a stupid grin on my face every time I start the old girl up to go for a run - and she really can run for an old 'un!!!
