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You say "full function" but that can have a few different interpretations...do you mean Full ETTL II or other functions too? Personally, I think the 430EXII is a fantastic flash...very powerful and has all the features of the bigger speedlites except the RF remote, external high voltage port, and master control. The 380EX is more compact (albeit a little less powerful) yet offering most features of the 430 but with an LED video light added. All these speedlites offer on-camera control via the 60D's menu. The 270/220/90 series don't have BOTH bounce & swivel which makes them less desirable for me but are the most compact choices that still have a (mostly) full set of features. I am not a fan of 3rd party speedlites for Canon unless you use them in 'strobist manual' mode.