What you listed sounds reasonable. Here is the specs of one of my Production SQL servers that is running on a VMWare machine. It has 2 Hyperthreaded Cores so it is really 4 CPU's. I dont really consider this a lightweight SQL server though because of the memory usage and number of connections. It has 50GB of RAM. It has 6TB of hard disk space allocated to it, but they are Thin Provisioned. Hope this helps.