The wonderful thing about Wordpress nowadays, is that it's very secure if its updated.. According to plugins and templates, if you just follow the guidelines from the wordpress codex, you should be covered. Sometimes when searching Wordpress's forums, you'll maybe find better solutions for doing things, but mostly if you use the functions wordpress provide, don't worry about security then, because they've defined it, and should be very secure..
So yeah, I would give it a try, especially if you've build a theme, it should be very wrong, if you could really make some huge security issues. At least when I've been doing some themes, I've been following the guidelines, and yeah, I haven't found any issues yet.