Do I need a Nexus One?

My two brothers each have iPhones. meanwhile I'm stuck with a cheapo phone that it's not worth getting the internet on.

Option 1: Wait 5 months for my T-Mobile contract to end and then iPhone 4 me!
Option 2: Get an as-cool-or-cooler phone that's compatible with T-Mobile. It looks like the Google nexus One is my best option.

What do you say? Give me advice please! : )