In my opinion, DO NOT TAKE the LSAT until you are ready to devote at least a month of studying an hour every night and a couple hours each day on the weekend. This is unless you are satisfied with mediocrity and want to go to a state university.
This is how I see a June testing play out... You study now, while you are trying to finish college and do all that fun stuff that you are entitled to do after 4 years of studying. Then you take the LSAT in June when you are only semi prepared, thinking in the back of your mind that you can always take it again. This will become a self-fufilling prophecy, and you will, indeed, need to retest when you get your score. Only now you have to bring up your score a LOT because most schools will average the two scores. So, if you first got a 160, you will have to retest at a 170 (98th%) just to average a mediocre 165. Not so easy.
As you can imagine, I am advocating an October testing where you are prepared and focused. It is MUCH easier to study more beforehand than explain away a poor score or try to improve your score by 10 points the second time around.
When I took the LSAT this February, I devoted my life to that damned thing for the month before. I also took a class to help make sure I was on schedule and to arouse my competitive instinct. But it didn't just end it there--I took tests on my own time and spent a lot of time looking at my wrong answers trying to figure out the underlying patterns. In a nutshell, I was obsessed. Do you think you have time for that as well as do 4 classes? Your call.
I am not saying that everyone needs to get as into it as I did, but it all worked out ok for me. I and my 171 are going to have a LSAT book bonfire this weekend.