what mic do i need for the ipod touch 3.1.3 8GB and how long of a memo can I leave?

I just purchased an ipod touch 3.1.3 and I need a mic so that I can leave long memos. My question is; What mic do I need and what is the memory capacity for the memo feature as I would like to translate case notes, sometimes as many as fifty sentences. Does the ipod have that capacity? It has a bigger memory that the brand new Mac PC that I bought so I am slightly confused. I appreciate that that is apparent but I really need your help. ASAP would be great.
thanks,
Alice

Apple Earphones with Remote and Mic

Apple Earphones with Remote and Mic

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