What type of field mixer are people using to get good audio via the HMC-150?

I was told the Sound Device Mixpre was an excellent choice:

Sound Devices | Mixpre - Portable 2 Channel Microphone | MIXPRE (http://www.bhphotovideo.com/c/product/292988-REG/Sound_Devices_MIXPRE_Mixpre_Portable_2.html#reviews)

Any other suggestions?

Simon