I have a 420EX, and will be shooting a wedding in May as a primary (yes, I've 2nd shot weddings before and am confident in my skills)... I wanted to pick up a diffuser and on-flash bounce card... found this bouncer on B&H... this is what I was looking for, but how does it attach? Will it work with a 420EX? I usually just bounce off ceilings or walls if I'm not using a strobe kit, but obviously that won't work for the wedding. Sto-Fen | #TW-UNI 2-Way Bounce Unit - Universal | TW-UNI | B&H Also, can I use a diffuser with it? I have seen photogs at weddings with the flash straight up with a diffuser on and a bounce card on there too... will that work? Which diffuser do you recommend? Thanks in advance!