Hey there, apologies for the delay in responding! Thank you for your interest in considering your web hosting options. We do have a reseller hosting option. To answer your question between shared and VPS hosting, I would recommend VPS hosting. This would allow each of your clients to have their own cPanel, whereas a shared account would only include one cPanel account. I recommend contacting our Sales Team via live chat for the most recent/up to date "rates". There are multiple options that you can consider; the prices are also available on our VPS hosting page. I hope this helps!
However another option is to pool together a cluster of physical servers into a cloud arrangement whereby the data is stored across several physical disks in several physical machines. This dramatically reduces the possibility of hardware related downtime by spreading the load and the risk of hardware failure. This is a High Availability Cloud setup which Pickaweb uses.
Partitioning a single server to appear as multiple servers has been increasingly common on microcomputers since the launch of VMware ESX Server in 2001. The physical server typically runs a hypervisor which is tasked with creating, releasing, and managing the resources of "guest" operating systems, or virtual machines. These guest operating systems are allocated a share of resources of the physical server, typically in a manner in which the guest is not aware of any other physical resources save for those allocated to it by the hypervisor. As a VPS runs its own copy of its operating system, customers have superuser-level access to that operating system instance, and can install almost any software that runs on the OS; however, due to the number of virtualization clients typically running on a single machine, a VPS generally has limited processor time, RAM, and disk space.