Which size Iphone should I purchase?

I currently own an ipod at the moment and I hoping to purchase an iphone. I have about 150 songs on my ipod.around 200 apps. 250 photos. And 25 videos (around 5 movies and a few less than 10 minute videos). I'm thinking I'm only gonna need a 16gb but I worried about not having enough space if I decide to put more stuff on there. Do you think I should just get the 16gb? Also, does anyone know of an online calculator where I'll be able to put in my details about how much stuff i'll most likely have on my iphone and see what size iphone i'll need? Thanks.

Added (1). Q,
iphones arent tiny, they're phone-sized (:
my current phone is about 2 thirds the size of an iphone and you think an iphone is tiny?

LMFAO

all iphones are tiny little things

how do you see anything or browse full web pages with a tiny screen like that?

& how do you see your erroneous map with a tiny screen like that?

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