Satin. We had some Scandinavian oil used on our Cypress Pine floors. Not sure of brand but its quite expensive when compared to the other brands. The key is a good operator of the sanding equipment too......

Ok here is a photo i just found...This is Queensland Spotted Gum, which is more varient than the NSW Spotted Gum. Friends that have seen it say how gorgeous and different it is...and so so glad we didn't end up going with blackbutt :)

I agree with Gallifrey, gloss and no stain is the way to go. Our brush box floors are nearly 20 years old and survived our youngest son rollerblading and riding his trike the length of our house. Yes, it does show dust a bit more, but it is much harder wearing.

The cypress pine that you have upstairs is a very distinctive look and I am not familiar with any laminate timber manufacturers doing anything similar in colour and knotiness. This means that you won't find a close match, so I would consider other materials that are completely different. Don't go with a timber-look laminate as it will look really fake compared with the real timber boards that are upstairs. In this photo there are three different flooring materials that are working harmoniously together. There is the clear-stained cypress pine on the lowest level, hardwood treads on the stairs, and slate floor tiles. (If you want to see more photos of this Pettit and Sevitt house then visit: https://secretdesignstudio.com/mr-mrs-modanest-danish-style/ ) Will your ground floor be on a slab, or on stumps? If you are on a slab then consider tiles, polished concrete or carpet. For your stair treads consider polished timber treads. Remember that tiles and polished concrete will last forever if correctly laid, whereas carpet and timber laminate flooring have a limited lifespan as they are much less durable. Best of luck, Dr Retro of Dr Retro House Calls