How busy are the production sites? If a dedicated server like the one @Mandemus linked to would handle them then your company could be saving thousands.
Granted dedicated servers are a little more involved but you could hire a consultant to set them up for you and show you how to make daily back-ups, restore, add new domains/apps, emails, etc
I use a single (64GB) server for all of my personal sites - and they are in various languages; PHP (Wordpress and some of my forums) Ruby/Rails, Static HTML/CSS and soon Elixir/Erlang.
