Hair Aspirations for 2010

So this is my 2nd time around being natural. Its been a little over 1 year and I'm getting to the faze again where I'm getting frustrated with my hair. So I have come to the decision that I'm going to loc my hair. It's seems to be the most reasonable solution. I want something a more professional since I'm going into the medical field and let's face it I'm lazy.

I'm debating whether I should get sister locks or just locs period. Basically I want to have options later on if I decided that I'm bored again and I want to take them out opposed to shaving my head. If you have any suggestion please feel free to let me know.

Here's some locs that appeal to me the most: