First of all, I would like to mention that you have made a great decision choosing Globaltap.com - really reliable company. I've had a good run with it. I highly recommend you to use Sun solaris for VPS. The Solaris project and task facilities allow you to label and separate workloads, as well as monitor resource consumption by each workload. One more important fact is that the extended accounting subsystem captures a detailed set of resource consumption statistics on both processes and tasks.