Think I went pretty mad with the optional extras as well.
MP3 - Almost all my music is MP3 anyway so it makes sense, the only thing that irritates me is it's difficult to find a specific track when you have 100+ tracks on there
Bluetooth - I bought this primarily because it came with the MP3 and the bigger MFD, turns out it actually works well with my phone and have used it several times with no problems
Xenons - Only used them a couple of times in proper darkness but they seem much brighter than my old Leon
Heated seats - not had chance to use these yet as it really hasn't been that cold but in the dead of winter I will probably wish they came with heated steering wheel as well
Auto Wipers - Brilliant, not only do they stop that annoying issue of 'screwping' wipers but at high speeds they seem to go in to some mode that gives you two wipes for the price of one by stopping in the down position before coming back up.
Auto Lights/Mirror - Again I've not driven in the dark often enough to notice the mirror that much (though mine doesn't have red down-lights as someone mentioned above). The Auto Lights work ok, I like how they come on when the wipers are going but I find them a little sensitive to light, increasingly over the last couple of weeks I've found them coming on a going off every few minutes because I am driving down a road with overhanging trees.
Spare tyre - If I have a flat tyre I want a replacement ready to go not some bloody foam!
Parking sensors - Best thing ever! As with the old Leon the rear-window is only good for spotting low flying planes so these were a must for me. I'm not so good at reverse parking and in my old Leon I would find myself shuffling in to a space only to get out and find enough space behind me to park a smart car. When I first bought the car I tested it by reversing at the garage door needless to say I had to get out twice convinced I was going to hit the door while it was still pipping.