We can provide a fully managed server for $149.95/mo for your traffic levels. Unlimited domains, with free (included) per-IP domain hosting included.
I won't get into the sales pitch, other than to say we've been around for 6 years now - and are part of a group of companies that manage a network of well over 600Gbps of traffic destined for the Internet.
Best of luck!
-Phil
phil at reflected dot net
www.reflected.net