$700

[Logician]

I think it is the best in the market so it is also most expensive. But if you check alternatives you'll see other similiar java chat rooms but their prices are not so cheap either (300-500 USD range). When the price drops, the feature list shrinks accordingly. I'd say instead of aiming the best of market, you should find the best solution according to your needs.

RealChat is very fine for its features but it has its downsides either: It is not very easy to install to your server and it requires a dedicated server. It is very customizable but customization is not easy. Its user interface does not appeal to me much, it is too "fancy" IMO (but needless to say, you can fully change it as you wish). It is very flexible to "program" it but you need time to read through its manual and help docs first to get the grips of it and the programming it is not for newbies.