Basically, there are two kinds of hypervisors. First there are the hypervisors that run on top of your operating system. These are called Type-2 hypervisors and include VMware Workstation, MS Virtual PC and VirtualBox. Then, there are the hypervisors that are an operating system (I know that is over-simplified). These are called Type-1 hypervisors and include Xen, Linux w/ KVM, VirtualIron, ESX, ESXi and MS Hyper-V.
What comes closest to what you want, is a Type-1 hypervisor. Judging you from your question, you are going to have a hard time with just about everything save for ESXi with its web interface. I'd go for that if you want decent performance and the option of a broad variation of guest operating systems. ESXi is a bit picky for the underlying hardware though, so if that is a problem, look into Fedora w/ KVM and / or Windows 2008 with Hyper-V. Latest option is pretty expensive though, if you do not have a Windows 2008 license already.