Tropicals & Tender Perennials: How many in one pot?, 1 by Anitra

Anitra wrote:
I am falling in love with begonias. :D

This 20-inch terracotta pot has:
* 3 tuberous begonias that I started indoors from tubers, this February: the biggest is beginning to bloom!
* 3 tuberous begonias that I bought in bloom, from the garden store
* 1 lone survivor of 6 begonia plugs that I ordered by mistake, thinking I was ordering more tubers
* 3 fuschias
* 1 astilbe
* a clump of impatiens

The last plants I added were the fuschias and impatiens, and there was bare ground then, I swear! :D It's a jungle in there now, and I'm beginning to think I should take out at least two begonias.

Recommendations?