So many options, which package should I buy?

Basically that's depending on your budget and to what extent you'd like to have control over the chat client.

If you're representing a large company and have enough budget, and if you prefer to have domination on the software license and want to have overall control over the chat client, you should definitely go after the full package: 123flashchat license+ video chat module+ video chat hosting. It may seems a bit expensive but in a long run it's worthy. If you're owner of a low budget small website, you may start with having us host all (text chat and video chat) and it's quite cheap in the video hosting business.

If I buy text chat for 250 user max, and video chat for 50 user max, how many people can chat at the same in my chat rooms?

In that case, all people in all your rooms can't exceed 250, while only 50 video windows can be activated. When the 51th person try to publish his video, he will get error message which means "try again later". That's not user friendly, so we strongly recommend you synchronize the text and video chat hosting levels.