I think you will get results whatever kind of coconut oil you use, but I usually get Nutiva Brand Coconut Oil which says Extra Virgin and Organic. The general idea is that it hasn't been too refined and had all the good stuff taken out, which is what the refining process does.
Some oils I also look for it to say Cold Pressed or First Cold Pressed (Avocado, olive, grape seed), which just means they didn't use a lot of heat to extract the oil because again, heat is the refining process is supposed to affect the good stuff in the oils.
And finally (if you really want to get anal
) First Cold Pressed meaning the first batch of oil extracted, rather than the second or third batch, the idea being that the first batch of oil pressed has more good stuff in it than the second or third batches pressed from the same batch of fruits (more diluted).
I guess they all probably work fine, but I think the less processed or refined the better, especially if it's just a few dollars more.