I'm leaning heavily toward the PHP options, but there are quite a few to evaluate. WordPress is getting a serious look because of its LiveJournal importer feature; really, after looking at some of the others, I'd have to say that it's the front runner.
I know I definitely want one that's will work with a handy update client comparable to Semagic. I sometimes update my LJ via the web, but typically, it's with Semagic. I just like having a client separate from the browser.