Don't write the 155 completely off, it won't get you into one of the top national schools but it's probably good enough to get you into a good regional school. I believe this is the first mistake prospective law students make(I know I did) is to get caught up in all the hoopla promulgated here and in various publications that is aimed at what it takes to get into one of the T15 schools, a worthy goal if you're trying to land a job at one of the biglaw national firms. However, finishing near the top of your class at a good regional school is probably going to get you the job in that region at some of the better regional firms. So my advice for any prospective law student is to really figure out where it is that you want to live and target the top regional school in the area and look at their LSAT numbers to figure out what you need to do to get in. And if more time ensures that you'll score high enough to do so, take the time. But if a 155 will do, go ahead and take it.