Cabinet for vibro-champ

[lowswing]

I own a 69' vibro-champ which i love and use a lot in my studio.
I'm looking for external cabinet for it since the 8" speker doesn't cut for many songs.
I had one expierience with a 1x12" tweed cabinet with tone tubby alnico speaker (it was 16ohm the champ is 4!) which both me and the guitarist were amazed from the cool tone and clarity.
what would be your recommendation (which cabinet, 1x12,2x12,2x10 other, which speaker,ohm watt etc.....)?