pvr said:
2003 had some quality issues, for example Petrol flaps falling off. No M seats available for 2003
2004 had better built quality, MP3 capable head unit from april onwards, brake force display lights from april onwards, bluetooth microphone on steering wheel instead of next to rear view mirror
2005 had better insulation in the doors to make them more solid, no orange in the indicators front, side or rears
IMHO a 04/04 build or newer would be the best choice. After that build the wiring harneses were more complete ( easier to mod because most all wireing was there ).
The 05 also had the clear third brake light.
The 03 did not have the one touch passenger side window operation only the driver window.
If you are looking at the steptronic trans, the 06 and newer has a six speed trans , the 05 and older has a 5 speed trans.
In 06 you have the larger motor,( 3.0) and the Si, M and coupe models.
06 and newer does not have a dipstick to check oil with.
03 and 04 does not have the round orange reflector on the front bumper.
06 and newer has curved reflectors in the flat area of the front fender .
04 and 05 have the updated ECU the ECU was also updated in 06.
06 and newer had the one touch three flash turn signals.
///M models have hydrolic steering assist 06 and older had electric assisted steering.
Thats all I can think of at the moment.
Sport and heated seats are a plus IMHO.