I have to second these recommendations.

Stick with Java. First, look at the job boards these days. Java is huge and marketable. It's a good OO language to learn, and a lot of the best OO training is in Java these days.

Invest in OOAD. Learn good OO Design. A lot of the best OOAD training is in Java these days... I highly recommend the Responsibility Driven Design approach also. Object Design: Roles, Responsibilities, and Collaborations http://wirfs-brock.com/DesignBooks.html is a good book for that. You can find it on Safari also.

Take what you learn and apply it to Perl. You'll learn a lot about Perl doing that. There are lots of OO Perl programmers out there, but not a lot of great ones. Good design skill is fundamental for OO quality.

Finally, Perl is my favorite OO language to work with. It's what-you-write-is-what-you-get approach is simple and powerful. Dynamic compilation, being able to change the nature of your program taking on new responsibilities as your data and input dictate... literally seeking them out and compiling them.. very cool.