Cheers for that Stig.
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I picked up a hähnel Giga T Pro II RF remote. Interval timer, the remote unit is small enough to fit in the palm (for getting in the picture if needed). I like that the remote unit can actually be plugged directly into the camera if desired (i.e. used as a wired release) for interval timing, etc.
You could also get a long sync cord (see, e.g., http://ocfgear.com/) which would let you use the 600 off camera and still trigger the 430 optically as a slave in ETTL or Manual, I think. The 10m cord is $65 and the 5m cord is $48.
The focus screen is user replaceable. The stock screen that came with your camera is the EC-CV ($39, B&H link, not sure about local sources for you), and it comes with the little tool you need to swap them out.
The Ec-D (grid screen) will fit the 1D X, as well.