Again, this isn't really something I think about a lot, perhaps because I don't play a lot of games that contain voice acting.
I decided on Buffy the Vampire Slayer: Chaos Bleeds
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Don't watch the whole video; it's quite long, but should give you an idea of things. Okay, you say - that shouldn't be surprising because it has all the show's regulars, but that's not entirely true.
Neither Sarah Michelle Gellar (Buffy) nor Alysson Hannigan (Willow) were available for the voice recording, but the people who filled in for them were convincing enough to fool me into not realising that until I read the cast list. For this reason, I chose this game.