Kin252 i would avoid the atomic mate, the top caps are wobbly and fall off. the trident v2 is a good dripper.
but the origen has to be the best. i havent tried a magma though, they do look quality.
That is the bottom half of the top cap, which itself slips to the deck on o rings, I saw a video that said the o rings made it difficult to get the cap off, so, may be inconsistency in o ringage, who knows, or, I don't, but I have mainly heard good things about the atomic, and it looks great.
not sure if you've changed you mind on the atomic, but I've been offerd one for the immo so if you still fancy one i could see if we can get a 3 way swop sorted ?