What size iPhone 5 should I get?

I have like 45gb of music, but i don't listen to all of them, and i currently have a 160gb ipod classic. I heard the battery life of iphone 5 is not that great, so i don't know if i should just keep my ipod and iphone 5 separate and get a 32gb iphone5 or should i intergrate the two and get a 64gb. What should i do?

Added (1). Also i'm planning to take lots of pictures in europe, with my iphone!

I personally think if you have enough money to buy the 64gb and integrate it. If it doesn't work out and the battery is too short, then put your music on to your iPod. Another option hats ok too is buy the 32gb and then choose only your most favorite songs to put on your phone while you keep the rest on your classic. The amount of space apple advertises is not exactly that much. It's a little less because of all the preloaded apps(notes, safari etc.) I have an 8 gb iPod touch and it only has 6.4 gbfree for my stuff. I say you can't go wrong with more space. That's just my opinion. Get whatever phone to suit your needs.

The question is why do you need to have all that on your phone? Offload it on the computer instead.

Defiantly get the 64GB model. Not only do you have a lit of music, but videos and pictures chew up space on the iPhone. Lets no forget, it does have a 8MP camera, and can record 1080P video.