How durable are the connections on the ports?

I am anxiously awaiting the birth of a new ASUS Transformer....will be getting it in a couple of weeks. As I think about the tasks that I want to use it for I begin to wonder how durable the ports are. I plan to connect it to the 42" lcd's in every classroom that I teach in. I will use one cable - and keep disconnecting/connecting it to the lcd but I started to wonder - how durable are these tablets? I plan on protecting it from obvious dangers - being dropped on the floor, moisture and dirt, etc but what about connections - and other dangers? dropping and water and dirt, oh my! :afraid:

 

Thanks! It seems to me that there is really only the 300 and 700 to choose from - I have to read more to see if there is any difference other than the faster processing speed.