I voted for the 2nd one because it most closely matches my preferred choice of the three. I don’t think Shakespearean English is necessarily the best fit for this setting, and I do think in order for this game to be the most accessible to the most people, it ought to at least be in English with other options available.
At the same time, I think Dan has the right idea in mind in going for something fairly modern without being too modern. I don’t think it benefits from having a bunch of present-day slang, for example, so if there are chances for various words that were more common from the period to be inserted, that feels like a good middle ground.
As far as accents go, there are absolutely people who can be hired that do not have a specific regional accent (such as Texan, or further, Southern California surfer). Immersion is important, but whether it’s a slightly British accent, a slightly German or Czech one, or just English with no true accent, as long as it sounds decent I’m not going to care too much. We can find any game out there with lots of voice actors and gripe about one or two of them sounding off, but what matters more to me is how good the dialogue itself is and how well the lines are delivered. We have to remember that in the end, the people hired to voice specific characters end up hired because the game’s creators probably think they sound right for those characters.