PCOSers which OPK do you use?

Analise
I am a skinny PCOSer and have regulated my periods to roughly 28 days of length through lifestyle changes but fear I still may not be ovulating. Has anyone had a similar situation and found that OPKs worked? Or perhaps a heftier method for more irregular periods? I've been looking at the clearblue fertility monitor since it measures LSH and Estrogen...  Opinions?