Far be it from me to tell you how to prepare your breakfast :0, but I would do two things immediately: diss the toaster and the electric percolator. Buy a folding metal camping toaster that you place over the stove (or just burn the toast on the burners straightaway! :nerd
, and use a thermos with Melita filters for coffee or use a French Press, or a regular percolator. I am sure that if you did a search on coffee on ANY boating forum, you'd find thousands of discussions just like this, and it has nothing to do with the quality of the coffee. You really don't have to take all your home appliances with you when you go on your boat, nor do you have to miss quality coffee.
Then you can size your inverter to your microwave and be done with it. 1000w Inverter sounds real good for a 600W microwave. Our microwave works just fine with a modified sine wave inverter if you want to save some $$. You also didn't mention how you're wiring it: into the ship's AC system or just use an extension cord.
Good luck, you're not the first to ask this question. You could do some searching on "inverter sizing" and probably find more posts, here and on other boating forums.
Xantrex has a very poor reputation these days. Try Mastervolt for an inverter.