2ch Upgrade for Unfocused Listening

I'm not much of a talker on this forum so forgive me for my rash introduction. I'm a father of two young boys, loves music and has little time to really focus on listening. That said, I am toying with the idea of upgrading my system to something a little more grown up. Current setup is a super modest, running a NAD D3020, pair of B&W bookshelves (10 years old), and a small Martin Logan sub. This system sits in the living room and is predominantly used for background listening though the occasional "sit back and relax" kind of listening does happen from time to time. If I'm not listening here, I'm at my desk working and listening to a pair of KEF x300a's. 

My big thought is to do a full upgrade, albeit a slow one, to something a little more special. Currently I have my sights on the Naim Uniti Atom and a pair of floorstanders (CM10 S2 really catch my ear), taking away the need for the ML sub. The big question is this however, will an upgrade like this where music is played more often than not when I am running around with the kids be something I notice? We all like to listen to music, but if we arent planted in the sweet spot am I wasting my time thinking we can achieve great sound throughout the space, making for a worthy investment at this current life stage. 

I welcome your input. And thank you greatly in advance.