Hi guys! I'm planning to get an external flash for my Nikon D3100 and i was scouting around for flashes that are economically priced. I was recommended the Nissin Mark II Di 622 flash and i heard about the Yongnuo (any particular model to recommend?). I'll get a first hand flash, so is there any particular flash model/brand will you guys recommend and why? Thanks so much in advance!!