I invested in two really good flash units (Canon 600ex-rt) with the radio controller for the hot shoe. Can you guys suggest affordable gear to pair with this (umbrella/stand/etc.)? I've committed to taking some senior portraits and I plan to use flash outdoors to help with any harsh light encountered. I'm not a professional and the equipment does not have to be top of the line....but I don't want any junk. All comments and advice are appreciated.