Welcome Biddy17,
sounds like you have some intersting months ahead with your Polo - I used to have a love affair with a G40 unfortunately it never went anywhere
:: sighs longingly ::
Waynne has a point with the JVC head unit, it has a good sound - however be careful before shelling out on DAB unit. The reception can be truly awful if your not in a good area of the country.
The bbc has a handy postcode checker for DAB reception:
http://www.bbc.co.uk/digitalradio/
If your area isn't good I really would reccomend keeping the extra pennies a DAB head unit costs in your pocket - or maybe put it toward some awesome speakers.