I tried a couple of them and sticked with CodeIgniter. Sure it has some quirks, but it's powerful, easy to grasp, not bloated (hello, Zend!) and more than capable to satisfy your web dev needs. Plus it has a great community and lots of tutorials.
But really, my advice is to spend a day or two trying several of them out. Create a simple project with each of them (the ubiquitous blog for exampe) and see what works for you. Good luck!
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