I listened to some various Celestion clips one time and the Celestion Lead 80 had the warmest tone out of 'em.
Also...... look into
Warehouse Guitar Speakers
They have some Celestion clones that are half the price and sound as good if not better.
I have a 4x12 loaded with their Veteran 30s (Vintage 30 clones) and they sound just as good as my Vintage 30 loaded cabs ..... but even warmer.