I eliminated from consideration any of the names ending in -en/-an/-on (might have voted for Stellan otherwise). I like Lennox Dean but Lennox does feel trendy next to Eden.
My favorites then are Levi Reid and Milo Thomas. Levi might actually work best... but I voted for Milo Thomas because it is my favorite name.
Oh my goodness, well I can see why you are struggling with a choice... I meant to vote this morning but I couldn't decide! I was literally hypnotized by your amazing name options and have been thinking about it all day. No matter what you choose, you son will have a wonderful name. They are all very handsome choices. Here's a quick outsiders perspective about some of their similarities between them, so hopefully I can help you decide if anything bothers you or not. Good luck! =]
L-names just like Logan: Levi, Lucas, Lennox
4-letters just like Eden: Levi, Cruz, Milo
N-ending like Dad and Sis: Dawson, Stellan, Jackson, Cullen
*If you want the name to be totally original within the family that would leave you with: Beckett (a great choice, and the one I voted for)