I liked cinc sentsis, pakta, and tickets a lot. Will have to check out the other places mentioned.
I really enjoyed Restaurant Informal, which was a recommendation I got from a few on this board. In general, I do prefer to wander around in Barri Gotic/El Born and just stop in one or two places that look interesting, rather than a more formal dinner. Most recent find was a place called El Chigre, which I would definetely go back to.