StExperience Bar is a rather easy XP bar to handle. Just a simple run through the lua file and you've changed bar texture, border texture, font, size and placement. And it's class colored, so it'll fit right in there.
As for CoolLine and PhanxChat, I don't have any experience with either of those two. Using Chatter instead. Might be a bit more options than I need, but I don't like to mess with the lua in every addon I've got. Takes more than enough time whenever I update them already.