I want to buy new motherboard with VT technology,I assume new ones all have this function in bios(I just do not see this VT explanation at mother board description area much)?
Take a look here. What are you searching for anyway? A AMD-V or Intel-VT based system? Why do you want this? Do you require high-level performance or it's just for educational purposes. I've found that any modern desktop computer would run something like VirtualBox easy-time.
sounds to me like a job for VirtualBox Will run on any PC/mac; I don't think that for a virtual Win Xp install one would need hardware support for VT