Considering WAF or GAF (girlfriend acceptance factor), I'm guessing there are three elements - size of cabinet, placement in room, and finish/design of the cabinet.
You have an advantage with two out of three. Because the Snell A series are designed for near wall placement, they do not intrude into the room as do most speakers. And in spite of their size, the Snell As I've seen had very good cabinet finish. Since you obviously enjoy your Snells, your girlfriend should be willing to accept one out of three factors, their size.
As for the Maggies suggestion, their footprint may be smaller but they must be placed well out into the room to perform to their best advantage. And with their height, can they really be considered a smaller speaker?
I'd keep what I have if I was you.
You have an advantage with two out of three. Because the Snell A series are designed for near wall placement, they do not intrude into the room as do most speakers. And in spite of their size, the Snell As I've seen had very good cabinet finish. Since you obviously enjoy your Snells, your girlfriend should be willing to accept one out of three factors, their size.
As for the Maggies suggestion, their footprint may be smaller but they must be placed well out into the room to perform to their best advantage. And with their height, can they really be considered a smaller speaker?
I'd keep what I have if I was you.