USB 1 or 2 and external HDD

Hi, I havae a Dell Inspiron 8200. Would you think that I have USB 1 or USB 2? And how would I be able to find out. The think is that I am interested in buying an external hard drive case to install an internal hard drive in it using an USB/USB 2 interface. Do you think I am doing the right think or would a i394 port be better? Thanks in advace