Best Headunit for my 2010 Elegance TDI

I have a very nice 1.6TDI Elegance but with no hands free, no wheel controls and no DAB..... So, i certainly want to join the 21st century and be able to make and take calls and i would not mind DAB, so can i fit a double din unit into my dash or will it have to be a single din. If i can fit a double then can anyone recommend a decent unit that will match the dash lights/look and that will have a separate mic so the calls will be clear, also given the unit will have a more powerful amp should i change my speakers at the same time. Thanks