Ask as many people and you'll get as many answers to your question on this one.
I agree hold off on the 8k and 16k. Also skip the small DMT plate, the 2 x 6 can be used as a flattener for the EP stones but it SUCKS at it. Just because you CAN do something isn't always the best reason to do it. Get a full size plate for flattening, trust me on this. I suggest the Atoma 140 full size or DMT XXC but the economy 140 plate that Mark sells will be fine in the roll of stone flattener for you. As for use on the EP get the Atoma 140 for the EP, it is more spendy but it is worth it for sure. Makes short work of repairs and new bevels. You might also consider adding a GS 2k to the line up. The jump from 1k to 4k is much easier with the 2k in-between, and having the 2k opens up more possibilities edge wise in your sharpening arsenal. The only other optional thing is to ass a stone to run between the Atoma and the GS 500. I find the Nubatama 150 to be perfect for this.
I too would go with a hand stropping setup. This set will get you started and it has the 140 plate and holder in it too. http://www.chefknivestogo.com/stsetwiunhob.html
Get the essential set.
Hold off on the 8k and 16k for now.
Add Atoma 140 and GS 2k stones instead.
Add stone flattener (Get a full size one, really.)
Go for a hand stropping setup.
Optional now or later 150 Nubatama or GS220/320 etc. for the move from the 140 Atoma.
This will be a setup that takes you where you want to go for years to come. Enjoy!
* footnote: The 2x6 DMT plates are useable on the EP as is but they are a pain in the ass. I think they really need to be mounted on blanks, otherwise they move and fall off the EP stone arm. Especially with the Apex, the Pro model seems to cope with them un-mounted slightly better but mounted they ROCK. That said if I had not bought all 4 of them first knowing what I know I'd have a set of the Atomas instead of just the single 140 for the EP.