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JaguarPC. I'm a very happy JaguarPC customer :D All their dedicated servers are managed.
Orbiter Dedicated Servers
* AMD 3500+ 64 Bit CPU
* 1200 GB Premium Bandwidth
* 1 GB Ram Memory
* 160 GB Sata Drive
$137/ No Setup
$117/ $97 Setup
Voyager Dedicated Servers
* AMD 4200x2 Dual-core CPU
* 1500 GB Premium Bandwidth
* 1 GB Ram Memory
* 2 x 160 GB Sata Drives
$197/ No Setup
$167/ $97 Setup
Genesis Dedicated Servers
* AMD 4600x2 Dual-core CPU
* 1800 GB Premium Bandwidth
* 2 GB Ram Memory
* 2 x 250 GB Sata Drives
* Free RAID 0, 1 by request
$277/ No Setup
$247/ $97 Setup
Odyssey Dedicated Servers
* Opteron 2210 Dual-core CPU
* 2000 GB Premium Bandwidth
* 4 GB Ram Memory
* 4 x 250 GB Sata Drives
* Free RAID 0, 1, 10 by request
$377/ No Setup
$347/ $97 Setup
All Linux/windows dedicated servers include:
* Full root access
* JaguarPC exclusive Nixcore account manager
* 100% Network Uptime SLA
* Hardware Replacement SLA
* Multi-homed network connections
* FREE initial server hardening and security
* FREE Moving assitance and data transfer for moves
* FREE Enom reseller account
* FREE 5 IP Addresses
* Choice of OS: CentOS, Debian, Fedora Core, Suse,FreeBSD, Windows
* Control Panel Addons for Linux : cPanel, Interworx, DirectAdmin, Plesk
* Control Panel Addons for Windows : Plesk and Hosting Controller
* FREE initial software installation: ( Apache, ProFTP, OpenSSH, OpenSSL, Bind, PHP, Perl, GnuPG, Qmail, Qpopper, Exim)