The big problem with DA or any razer product used to be its RMA don't know what the situation is like in the present scenario.
One more thing about DA though its ergonomically very good, i mean really good, but has very tiny teflon feet. I mean its like watching Yokozuna sliding around on chicken legs. So if there is even a little moisture on your pad(no you dnt need to spill water on it, even the moist weather will do it) it becomes almost impossible to have a complete control over it. Secondly, in 6 months or so you will start noticing that its feet has depleted even more and now they are really tiny.
I have heard that g400 doesnt have that problem plus its logitech so RMA is not an issue either. My optimal choice would be g400. They are almost equal in size not much difference really. g400 is not small by any means as well but it aleast has proper sized feet. Had your budget been on higher side I would have recommended Kinzu v2 pro or Kana for optical and roccat Kone or Sensei for laser(though with better and much dense pads than goliathus preferably Hard mats)
P.S. sorry for lengthy post but whenever it comes to gaming mouse and pads I get too excited
P.P.S. If going for DA, go for the black edition, specs are the same but black edition looks Evil