I tend to think uhhh 8mb is a good average per song so to fit 2500 you'd want 20gb. Not sure how big the file sizes are on your songs but if they are averaging 8 mbs than that is how many gb it would need.
-1000 mb in a gb. Though also if have all in one file on your pc is should say if you right click and check the properties.
-125 songs can fit on 1 gigabyte if they are each 8mb.
Looking at the ipod Touch online I tend to think it falls more in the tablet category than a phone. I'd probably go with just a simple mp3 player that is cheap and can fit a large micro sd card into it.
https://www.amazon.com/MYMAHDI-Digit...Y1KAXX0SZHWPC3
is an example. A 64 gb sd card is like 15 bucks.
Though not sure that is the exact route you want to go lol. Just a suggestion from someone who is up at 6 am in the middle of the night.
Personally I've always used the sandisk clip players because they are small and I can clip em on.
Not sure how Itunes work since never really been fond of Apple products in general.