Not the parent, but I work the same way, and I tend to allocate 2GB RAM per VM. I haven't really used my Windows 7 guest yet, so I don't know if that one needs

Not the parent, but I work the same way, and I tend to allocate 2GB RAM per VM. I haven't really used my Windows 7 guest yet, so I don't know if that one needs more, but for everything else it's enough.