I’m pretty excited about the launch of the Nexus One tomorrow (even though in Engadget’s video demo Android’s schmancy new Live wallpaper process crashes, see minute 4:09). Since my AT&T contract is up I’m planning on getting one along with a new two-year T-Mobile contract. Even though I hate getting locked into another contract, dropping almost $500 on an unsubsidized phone felt like a little too much. However, it looks like the phone plus a data-only T-Mobile plan might just be cheaper in the long run (provided you’re ok with being dependent on a paid Skype account). Here are the numbers.