I'm going to completely disagree with you on the choice of white. For me Nevada white not like cream at all more like fresh snow with that glint if sunshine on it. The standard white looks alot more like a cream colour. Also the cloth seats are imo alot more comfortable than the alcantara.
And I'm pretty sure the seat sound system comes with sat nav high.
The tech pack leon frs have led lights all round
Completely agree with you on the colour debate. When I purchased my car, I took a photo of it and in the background was a non-metallic white - the Nevada white on my car made it look very creamy, almost yellowy. Nevada looks fantastic when nice and clean on a sunny day.
I have alcantara and I really rate it, but that being said, if I had to have chosen cloth, I wouldn't complain as I think they look great.