Back when we did it, we were one of the last to pick your own colours instead of having a scheme. Our roof is charcoal, we upgraded our bricks to Truffle, our aluminium windows / door / garage are Dune. We got a higher ceiling height, put in an exhaust fan in the laundry, mirrored wardrobe in master, Ceasarstone in kitchen (oh! Just in case you don't know - overhead cupboards are not included in their price), we got extra windows / turned one window into a sliding door (these were much cheaper than we thought and are worth asking for).
We were originally charged over $4k for upgrades necessary for being in a Bushfire Area - but the zones changed and we were credited that money.
One thing I can tell you about flooring, if you have the money don't go with laminate flooring. We went with it thinking "how bad can it be?". Looks great, until you have to wash it. What nobody tells you is that you can't get this floor wet - so not ideal to sit a kitchen island bench on. Instead, they give you a spray bottle and a microfibre mop to get you started. I don't think this is acceptable. If you don't have the money to upgrade, then in my opinion it isn't worth paying more to have more colours available. We went with Coffee Oak, which was in the basics, and that colour is very nice. Save your money for an eventual floor redo if you can't upgrade right away. Oh! One more thing about floors - be careful where you expect carpet and laminate to be. They had carpet in my Home Theatre Room when I was under the impression everything but the bedrooms were carpet. I paid extra to get rid of that.
You'll find your way ...
And yes, very excited to have Christmas in the New Place. I want to start some traditions, just not sure what.