I'm pretty much in the same boat as you; I'm also a junior, taking the June LSAT, and want to pump up my GPA as much as possible. And while we all know the extreme emphasis law schools place on numbers (GPA/LSAT), I would recommend going with the upper division courses. First of all, I agree that 1 and 200 level courses are not necessarily conducive to better grades. There are a host of reasons whey I believe this, but if you're looking for evidence to support my claim, note the "upward trend" present in so many students' undergraduate careers. Also, I can't help but think that loading up on fluff courses is a pretty obvious tactic through the eyes of adcoms, and might work against you in the event of a tie-breaker.