Hey!
Are you offering HVM or paravirtualization for the VPSes? How many cores and what weighting are you allocating per size?
Thanks,
Teran
The box is running Citrix Xen so it supports both depending on the guest OS. If you're using ubuntu or centos there is a template which should install the correct kernel and windows has a driver set you need to install on your guest.
Regarding cores -- there are 8 cores on the box available to all with proportional weighting. However, if you're going to be pounding the CPU 24/7 I'd prefer you look somewhere else.