An alleged slip of documents tonight hints that Google's Nexus One will still cling to a traditional phone model and could actually be more expensive than its rivals in the long run. While it would remain true that Google would sell the phone itself for $530 unsubsidized, Gizmodo sees through a website prototype that the search pioneer would still sell the high-end Android phone for $180 on a two-year contract with T-Mobile, much like any other high-end smartphone. Those who cancel service before three months of service are up would have to pay the full $350 differe