Symfony 1.3 or 1.4 is the right choice. 1.3, if you used symfony 1.0, 1.4 before, if not. I personally am not a fan of the subframe in symfony 1.1+ for many reasons, but you may find it quite acceptable. Then this is a personal choice.
Symfony 2.0 is unstable, and many of the features that it represents are not the ones that, in my opinion, will really be of interest to the developer at this point. sf2.0, however, is an impressive exercise in creating the next generation of web frameworks; but not in creating sites that you make more feature rich or easier to develop. This can make them faster and more elegant under the hood, but this is not necessarily the main advantage of the platform for the developer. An example of this is dependency injection. This is another abstraction of the already excellent symfony core code components, and its inclusion only increases my respect for the core symfony team and their achievements, but for the end user this probably leaves a lot of head scratches over the advantage.
The main advantage of Symfony when you evaluate the basic structure is the community and its plugins, and this, in my opinion, is a decisive factor for sf2.0 right now. Yes, I know that it is essentially built from "plugins", but you will not have several important plugins, I am sure, and you will either have to write them yourself or adapt existing ones. It is for this reason that you reject the Zend Framework.
However, only my opinion. I have been developing Symfony 1.0 and 1.1 (mostly 1.0) for over 3 years now, and it still hasn't let me down.
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