Here are a few other good comparisions of caps. They deal with crossovers.
http://www.humblehomemadehifi.com/Cap.html
http://www.10audio.com/sonicap_oimp_multicap.htm
http://www.humblehomemadehifi.com/Cap.html
http://www.10audio.com/sonicap_oimp_multicap.htm