Enterprise class, modular and scalable application

Enterprise class, modular and scalable application, this is what I need to achieve with the application I'm going to start working on soon.

My question is for a recommendation from you about what framework or tool to use in order to achieve this.

I'm interested in any articles, study cases or books you might have in mind regarding this.

Thanks in advance,
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What have you found yourself?

The better question is: I've looked at product X and Y but I'm not sure if using method Z is a good solution. What recommendations do you have regarding these?

Well,

The alternatives I was looking for are building applications using the MVC aproach using one of the open source PHP frameworks like CakePHP of Symfony.

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You're looking for alternatives to MVC/CakePHP/Symfony? Or you are considering use those?