The best sigs are on a black background look up panini Noir NBA to see use gold pen will look insane. TBH would never buy and IP they look cheap and tacky on a white card with a colourful picture and black pen.
Theres a big difference between #1 cards and 1/1. These could go for anything. Some people ive seen offering $1000 for a 1/1 and I think that will be short of the mark.