Hi, welcome to fantasy, the thing about DE is that in august they are going to be re-done, so I would probably wait, I think the modles that are not going to be re-done are:
cold one chariot
I'm not sure about this so hopefully somebody else can comfirm this for me.
If you want to start those are the models I would buy, but you could always wait and keep doing 40K (I'm guessing you used to do them as you called the army book a codex), until the new range and book comes out.
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