Hi Parisa, welcome to the forum. I took delivery of my plus 4 in September, and love it.
I went for stainless steel wheels and have been very pleased with them. Both for the look and ease of keeping them clean. I am happy with the 6x15's.
I also went for the easiup vinyl hood as I will only have it up in an emergency. I do however prefer the look of the mohair hood.
As far as steering wheels are concerned, I agree with you, and assuming we are talking about the Moto-lita steering wheels, that the walnut steering wheel has a better feel than the riveted wheel. I am off to Moto-lita tomorrow to make my final decision, as I like the leather feel for touring and would be happy with the walnut wheel for show. I will go for a 14". Ideally one of each!!
I did not go for visors. I just use good sunglasses (serengeti's).
The only option is wish I had chosen was a clock. At the time I was worried about battery drain, however with a CTEK charger installed that would not be a problem.
Good luck with your final choices.