I am located in the U.S. - If I ever break down and order one of these are there any accessories or extras that I would be wise to purchase at the same time?
I'd like to be the one to say that you need not buy anything. I didn't when I got mine, and it's fine. Of course, if you plan to use a water device from the outset, you'll want to accommodate that. But if, like most I'd venture, you plan to use the device as is (at least at first), it comes with everything you need to enjoy it _thoroughly_. Things will break and wear out over time I suppose, but unless you're unbelievably unlucky, you have time before things start breaking. Someone recommended buying a 2nd cooling unit immediately. This I cannot see. The cooling unit is pure stainless steel. It's certainly not going to break. The only advantage of having a second one is that you can throw it in while you're cleaning the first — which takes all of 5 minutes.
So I'd say kick back and enjoy (chances are near certain you will) and see what you need then. Accessories take a while to arrive so when you think you may need them, plan ahead. For the record, the only thing I got extras of beforehand, and I didn't buy them through Tinymight, is batteries. About a week ago I ordered the extra O-ring pack for when I will eventually need it. I don't use a water device . And btw, the TM deserves every accolade. Enjoy, and good luck!