Xhosa sounds fun. I like the idea of learning a language that's so wildly different from any language I know, and that requires a whole different set of pronunciation techniques.
I speak English, Spanish, French fluently, and I can get along in German and Italian, once I'm surrounded by native speakers. I, too, am always working on my Latin. (I'm reading Horace right now and it's blowing my mind.) I'm saving Ancient Greek for my dotage.
Right now I'm working on learning spoken Arabic. There are a couple of guys in my neighborhood who are patient enough to listen to me butcher their language while I'm trying to learn. I'm so grateful for their help.
I love studying languages. I love being able to communicate with people from other cultures. Every time I learn another language, my overall understanding of human expression becomes richer.
Plus, I love to read, and every time I earn how to read a language it opens up a world of new books to read. My next reading language will probably be Russian because there are a lot of Russian works I'd like to read in the original. On the same note, I am so glad that I learned to read French because it's such a enjoyable language to read in.