Thanks for the insight! I have noticed that a bunch of the places selling DT Swiss wheels in the EU no longer ship to the US. I guess that means that now is the time to pick up a set.
I didn't realize that Merlin sold takeoffs; I don't have a problem with that and I don't really need the extra caps or driver, but I was factoring the 6-bolt rotor adapters into my numbers. The rotors on my stock wheelset aren't anything special, but they are 6-bolt and I was planning to use them until they needed replacement.
I will definitely keep the G1800 in mind. The 1600's have a welded rim over the pinned/sleeved rim with the 1800's, but maybe that isn't a huge deal. I'm not overly concerned about having a quieter hub and the small amount of weight difference doesn't matter for much really.
I'm in the same boat as you. Can't decide on whether to purchase the g1800's or the gr1600's... ughh! Still looking for other options as well that are available here in the US or a UK website that ships free here to the US.