I have the AT&T Galaxy S II and it's a great phone. The battery life is the best I've seen on Android so far (I'm sure there's newer phones that are better by now) and it's very fast. It would be a shame to see it go since you can get it real cheap now. It was worth the original price when released last year and it's absolutely worth the current price, which is right around $50 or so now.
The iPhone is a great phone for sure. It's very fast, made much better quality than any Android and the OS has always ran smoother than Android. I have a TON of money sunk in iOS apps and games, mostly games, which is why I still get tempted by an iPhone. But there are some things about my SII that I'd hate to give up right now. I would like a new iPod touch, as long as they release a 128GB version as my 64 is not cutting it at all.
Even though Apple is the king of stealing/copying, it has always been 100% obvious to me that Samsung has been ripping Apple off for quite some time now. Though, I could care less personally.