Depends on what you like...screen/speed are unbeatable on the 8700 but some people love the 7100 smarttype and small form factor. The 7520 has the GPS and direct connect, so it all depends on what you are into. Personally, I have had 7510/7520/7210/7280/7290/7100/8700 and the 8700 is light years ahead of the rest!
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