Hi,
Yes the GTI comes with the auto wipers, lights, dimming mirror, footwell lights and rear reading lights as standard (known as the convienience pack on the other models). The luxury kit includes the electrically folding mirrors and auto tilt exterior mirrors when you select reverse and the puddle lights. Don't really think there was much else in the luxury pack.
I would look at an aftermarket kit for the ipod as tbh the standard ipod adaptor is neither cheap or that good. It plays the ipod fine but the interface is limited to either 5 playlists or it just plays the entire content of your ipod in song order. Its also worth noting that if you have one of the newer ipods the dock won't charge them as apple changed the pin configuration in the newer ones (touch gen 2 for one).
The ten speaker set up was standard on 05 plates but penny pinching VW cut this down to 8 speakers from around 2006 onwards. Over and above this you might have the optional amp (have a look under the plastic cover under the passenger seat if its there or not), but I don't think this was that well reveived by those who paid for it. I found that the speaker set up is pretty good, but the HU makes a huge difference. When I got my car it had the terrible RCD300 (and the rcd500 is the same except it has the 6 disk changer) and I thought the sound system was rubbish, lots of distortion and vibration if you turn the volume up. I upgraded to the MFD2 sat nav and the improvement in sound quality was like night and day. So speakers are fine unless you are really into your music but HU is the limiting factor.
Being an 05 plate it will have certain 'features' that the accountants removed from later models like blue tinted glass (rather than green - looks nicer IMO), the aerial is integrated into the rear screen, 10 speakers as standard, silver ashtray cover, three reading lamps at the front vs 2 in later models etc
