What is best to get? 16gb, 32gb, or 64gb?

So I'm thinking of getting one of the recent iPhones, but I'm not sure if I should get one that is 16gb, 32gb, or 64gb. I like music and want to put songs on it, but I don't want put any more than 200 songs. Since I travel a lot, I download quite a lot of apps, like the social ones, games, and etc. So I wouldn't get bored. I also take a lot of pictures and videos. So which one should I get?

If you're a heavy user and a heavy downloader, buy 64gb.

I always thought the more memory storage is available for a device, the more options the person can have. So if money isn't an issue, get the biggest one.

You can buy the 16GB and store all your pics and music in the cloud not to use up your phone space but you'll need an internet connection to listen to it, otherwise the 32 GB is enough storage space for most people.

16gb is way more than enough for 200 songs but video (especially HD) can take up a lot of memory. If you plan on mixing music, video, pictures, and games onto one storage device I would at the least get the 32GB.
Amazon carries some at good prices, I found my 32gb and 16gb on Amazon for almost half the price of what it was gonna cost in store.