I've been thinking about a Samsung Galaxy Note 2. Do I need to let this feeling pass and buy an iPhone 5?
It really depends on your needs. Do you have an iPhone right now? iPad? Are you at all invested in apps in the iOS ecosystem?
the Note 2 is a giant "cellphone" ... and while it certainly has a lot of neat "specs"... You have to narrow down what you're looking for in a phone. Both can work great.