The only inherent limitation with an efficient speaker the size of Lore is probably low end extension/flatness.
A sub or two could fix that if needed.
I wouldn't worry about the cost ratio between speakers and the rest at all if things are sounding good.
Its when the room is very large and/or teh low end extension is limited and or the system cannot play loud enough without compression or amp clipping that an additional investment is most likely required.
If bigger, deeper, louder is not a concern, then you have a fantastic chance of getting things to shine their best with a smaller investment in speakers.