I only have professional experience in PHP and Perl. I've learning/using in my personal projects Ruby, Python, Objective-C/Cocoa, and Java. I'm trying to learn

I only have professional experience in PHP and Perl. I've learning/using in my personal projects Ruby, Python, Objective-C/Cocoa, and Java. I'm trying to learn the basics of a new language every week for 6 months. Then I'm going to focus on the ones I like best and dedicate a few months to learning the ins and outs of each language. Thanks for your reply!