You guys are doing great work! I own a small hosting company and own my own server. I know what you guys are going through. When you own and manage your own equipment it can get a little hectic.
I would like to offer a suggestion though... I am using a great company for co-location of my server. Its a company named ColoPronto, they are a division of Infolink. Check them out here:
www.colopronto.com
If you dont want to go the route of owning your own boxes, they have a sister company from the same parent (Infolink) named ServerPronto that offers some of the best priced dedicated server packages I have found on the net.
Check them out here:
www.serverpronto.com
They are so competitive with pricing and hardware at ServerPronto, that we have made the decision to switch to their dedicated packages whenever we outgrow our current owned and co-located server at ColoPronto.
When you lease a dedicated server, you dont have to worry about hardware failures as much.... they manage all the hardware for you with on site techs. A friend of mine has their smallest dedicated package and he loves it. I can personally vouch for ColoPronto as excellent since I have had my box colocated with them for over 3 years now.