I know this post is older and I'm not sure if you're still looking for a Gyn or not.
I'd like to second the recommendation of Dr.Dunn as he is an absolute angel and the reason I have my daughter
If you aren't TTC though, I would think that Dr.Shenck or Dr.Valdes would be great choices. There are several other OGA docs that have a satellite office in NW Hoston by Willowbrook Mall and I would think that being in that large practice with so many RE's who are knowledgable on PCOS, they should also have a good understanding of it.
If you don't want to see one of the docs down at OGA by the dome, perhaps they could recommend someone in the NW area?
I actually live in the far NW side (Cypress) and could give you the name of my Ob/Gyn but I don't think he's all that good with PCOS

He didn't diagnose me, it took my second RE (Dr.Dunn to catch it) but he will give me my Glucohpage prescriptions and listens to what I want him to treat me with.
Good Luck

Feel free to PM me here if you want more info on my Ob/Gyn.