The 9900 is their "premium" phone with the highest resolution of all of them. With that being said, I would not go with any Blackberry phone these days. Both their hardware and software are behind the likes of the HTC One X, and iPhone 4S. Both of those are dual core phones, with the HTC offering 1280x720 and the highest pixel density you will currently find on a phone... with the iPhone offering 960x640 resolution.
The HTC One X runs Android 4. If you consider yourself a "power user", that's what I'd go with.
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