LS3/5A owners - what sub do you use with them

Hello Everyone,
I sold my main system speakers some time ago and decided
to temporarily try the LS3/5A's.
Now I am so addicted to their sound and consider keeping them in my main system.
As my room is a bit too large for LS3/5A I want to add a sub which would give me fullrange LS3/5A sound.
Your thoughts/help would be highly appreciated.
Thanks.
Orlin