Have you considered letting multiple characters pool their starting XP to get a large ship? It's the kind of thing that's normally the focal point for a whole group, after all.
With that in mind, I might ballpark it at +5 TP for something like a Unity-class spheroid dropship and +10 TP for a jumpship or warship, with modifiers for things like outdated technology or special features like smuggler's holds.
Edit: If you're trying to figure out how much money you'd get annually from each kind of ship, I'm honestly not sure where you'd find that out. It doesn't seem like it'd be the best measure of a warship's value, though, unless you are into piracy. Which could be fun. :)