ITunes won't let me put music on iPhone?

I want to sync about 100 songs onto my phone, I've already got 4, 2 GB free on my phone, but it keeps saying "… Not enough free space to hold all the items in the itunes library (additional 1, 43 GB required)."
100 songs are 5, 6 GB? I don't think so, so can someone please tell me where this is going wrong?

Itunes is SHlT
Trust me, you should get this program called Copy Trans Suite. It's freeware and it's an alternative to iTunes. It works like a charm, you don't have all those stupid issues from itunes (like having to remove what's already on the phone when you sync).It's pretty much just drag and drop stuff to your iphone. I use itunes to download stuff but Copy Trans Suite to sync with my iPod touch.

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