That sounds like a good move on your part Toby, the 20% is no small matter. The reason I asked about the other stuff is it's some of the things many people don't think of when getting a ded server. Things the seller never mentions until you're up to your ass in alligators.
Sounds like you're happy with your host, which is at least half the battle Toby. The fact you have a backup system being maintained by your host is no small $$$ matter. A fully qualified backup can cost as much as your primary. A lot of peeps don't consider that when they decide to get their own server. Until it's too late. Many (not all) hosts hit you with an upsell 60 to 90 days after the fact for backup services.
Having 6 active domains is no small matter either. Don't sell yourself short

Lookin' good dude!
Have ya' thought about that hunderd bucks? |confused| I'll send ya' a self addressed stamped envelope if ya' want?