How to know which gb iphone to buy?

I have an 8gb ipod touch right now, and i'm hoping to get an iphone soon.
i used up about 6 out of my 8 gb on my ipod mostly just on songs.
i was wondering, if I buy an 8gb iphone and upload my songs and stuff to it, will the 2 GB be enough for pictures and contacts?
or should I just go for the 16 gb phone?

I'd recommend the 16gb since you have 6 gb of songs, pictures and games all add space!

Pictures and especially videos take up a lot of space, so I would get a 16 GB. Actually, I don't think that the latest iPhone even comes in 8GB.

Get the 16 gb

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