My favorite OWB holster is my Blackhawk SERPA holster. But, it isn't really a CCW holster. I use it when I open carry.
For CCW with an OWB I really like the Don Hume Agent 711: Open Top Concealment Holster. SEE IT HERE.
It costs about $58 and is very well made. I am usually a Kybex guy but when I want a leather holster for one reason or another, this is the one I reach for.
They also make a version with a thumb break. You can see it HERE.
It usually runs about $65.