Value of 16 x 9 and 16 x 7 Fuchs?
 

Factory finish. Black centers are in very good shape. 16 x 9's have some curb rash, but not terrible. 16 x 7's are in very nice shape, with a slight tire machine marks being their worst feature.

What are these selling for? Is it better to sell the set or split them up?

I've seen wheels like this go for anywhere from $1000 to $2000. The 9"s are where the $$ is at. Most 7's go for about $200-300 ea. The 9's, anwhere from $500-750 each. Depending, of course, on demand ;) (this was of about 2 years ago when i was actively looking... I went with Karma.. found a set as you mention for $1K.) You will likely get offers for the 9s first.