iTunes on Windows should be classified as a Virus / Malware. It's a bloated resource hog that should be removed faster than boobies on an iPad.
If you buy alot from iTunes, you don't really have alot of options though. But, if you don't - I highly suggest you try DoubleTwist. And don't let the front page AirSync fool you, you don't need an Android device to use it. But if you do have one, DoubleTwist is a must. In fact, even if you use iTunes to make purchases, I still suggest you download DT and use it as your primary interface. It can import all your iTunes playlists, music, podcasts, videos, etc. and will sync with almost any device.