Well... I got one of these: https://www.guitarcenter.com/Trace-...ybQzLYUa7JkVX3zAvtvBC7RwHcYz7jOxoCT4MQAvD_BwE
And I got a 1x12 cab because it sounded great and was used (and cheap). I would like to be able to fit it under my chair though. So now what would be a great under the chair cab?
So you've bought a 200W Trace Elliot ELF and a 1-12 cab. Seems good to me!
I wouldn't sit on the cab. I'd put the cab away from me, near a wall or corner if possible, then sit in with the other players and get the volume mix right.