In the first level of the game, in the first location, there will be no dialogs as such. This voice acting is just an addition to the character’s “thoughts”. In general, see for yourself. In fact, it will be something akin to system messages.Honestly? None of them sound especially good (with #2 easily being the worst, IMO), and I'd be leery of even using one of those synthesized voice things. Even the best ones ultimately sound a bit off. They're fine for some purposes, but I don't think they're good for game dialogue. Occasional narration maybe, but not dialogue. I totally understand having no other options, but personally, I think it'd be better to stick to voiceless text boxes if you can't get an actual voice actress of some kind. Maybe others will feel otherwise, but that's my two cents. If you do end up using one, I just ask that you make it an option to toggle it off in the game.
Well, of course, the settings will be able to turn off the voice if you want it.