Hello and welcome to the forum...
I know three types of guitars,the electric,the nylon string and the steel string.The nylon is what you will hear as the classic guitar while the steel string is the acoustic one.I think that the semi-acoustic and the electro-acoustic are one and the same.As Karcey sais they are called like that because they contain a pickup inside and they can be played with an amp.The electro-acoustic can be played without one also,it is not like the electric.The difference is that just by using an amp,you can add effects to it and play it a lot louder.The price of the electro-acoustic is a bit higher because of the pickup.In the web you will find exactly the same guitar(same company,some woods)sold at about 50 euro more expensive that a simple acoustic.The reason as I said is simply the pickup...So it is up to you,what you are after with the guitar you want to buy and budget...The best of luck making the best decision...
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