I like Michael Johnson as well, but I'd rather have Orakpo.
I think the Texans need to draft a DE first and foremost.
Orakpo is #1 on my board. Orakpo is a little undersized, but makes up for it with his power,motor, and strength. He has been injured a few times, but I still think he is the best DE available.
Michael Johnson; Man this guy is an athletic FREAK(like Orakpo), but in a different way. He is 6'7 and has a very athletic build. The reason that I like Orakpo more is that I think Orakpo would do better on the other side of Mario Williams. I think Orakpo has a higher motor than Johnson and think a high motor guy like Orakpo would do more destruction combined with Mario.