What's the best decision in my situation?

[Peyman Ayoubi]

Hi,

I'm about to close on a property in Seattle area. The property is 3B1B and I plan to add an extra bathroom it 3B2B. However the layout is not very straightforward (like below). I should add that there's stairs to the basement which is finished and it has a big area. What I'm thinking about is to combine bedrooms 1 and 2 into a large primary and add a full path adjacent to the current full path. 

This will make it something like this (the dimensions are not accurate, just for representation) plus there's going to be the 3rd bedrooms in the basement, making it 3B2B. 

Should I make this change? What other think about it? 

I'm not sure whether having a bedroom in the basement is good enough. I'm open to ideas if anyone would like to share their opinion.