Which A3 for £15k

Hi all - 1st post and all that

Wonder if all you experts could give me some advice. We are soon to become a family and therefore have to sell the Boxster and get a suitable 4 door car that looks the part, is safe but sporty.

The A3 comes top of the list

Here are our spec requirements - can you please list which is the best A3 model variant from these?

- £15k maybe a little more
- Below 20,000 miles
- 4 door
- Petrol - any variant
- Sports spec - got to look really good !

Questions-

1) Which models would you recommend from the above and why. We would prefer a clean new model A3 1.8T over a rough 3.2 - but are open to suggestions - we are looking for a clean car at this sort of money?

2) Does someone please know/ list the main improvements with the new model to the older version?

3) Does anyone know the safety rating for the A3 and whether this has improved with the newer model?

4) What is the best all round petrol engine - performance vs reliability and why?

5) Are there any MUST HAVE options and any MUST NOT options?

6) Anyone got an A3 Buying Guide link?

7) Could anyone suggest a very good Specialised Audi Car dealer in the south-east (England ) - home counties area?

Sorry for the all questions but appreciate any advice

thanks