QTR-Quadtone RIP

1. What is a good quality densitometer/spectrograph that can be used to 
do custom curves with Quadtone RIP? Is a UV filter or software that can 
compensate for optical brighteners necessary?

What price is a suitable device?

2. Does anyone do on a commercial basis custom curves for those who do 
not have a densitometer/spectrograph?

I have had no problem getting good quality ICC profiles for color 
materials such as RA-4 paper or inkjet color, but the profiling service 
I use says that they cannot do black and white.