For high-traffic/high-volume hosting I would highly suggest the guys over at OKTeck http://www.okteck.com/ .
I do not get anything for suggesting them, but they do currently host JVNotifyPro, IM4Newbies, and all of our other stuff.
The guys behind OKTeck used to be the technical force behind Kiosk.Ws until Kiosk moved from canada to texas. What I like best about them is that they don't just know servers inside and out, they are human beings and you can reach them with a single phone call.
Back when I had a stint as Mike Filsaime's in-house technology guy, if Paydotcom had a single burp, all I needed to do was call Jamie Savard and everything would be straightened out immediately. Since then, I have consulted for various IMers to keep their launches stable and I was able to coordinate with OKTeck for everything from clustering for load balancing to cloud services.
If you have any questions at all, feel free to PM me directly and I can put you right in touch with Jamie or Dan.
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