I just installed Path Audio resistors in my crossover and so far I am very pleased. I think they make resistors for speakers only. High wattage rating, 10 watt, resistors in lower speaker values only. I am not 100% sure however.
I have not heard or used Khozmo attenuators, but love Shallco stepped attenuators here in the US. They use silver contacts and are very high quality. Many suggest they are a step over the Khozmo. The Vishay Z Foils would be very good indeed. They are very resolving and clean. It all depends what you are after. I would most likely use Shinkoh resistors as they are more musical to my ears. They are richer, warmer and still deliver plenty of resolution. If absolute transparency is what you are after, then the Z Foil TX 2575 is the champ.