I have some BH-5 sticks now. I picked them up used, through forum sale/trade. I'd say BH-5 or BH-6. You might be able to find some used in the various forums where you can buy/trade. I'm unsure about CH-x Winbond modules. It sounds like the older Winbond is the way to go on these boards, and I'd have to agree with that.
I also have some Hynix DT-D5 sticks. Those sticks don't really seem to like this board, at least not nearly as much as the BH-5s. I have noticed a world of difference with the Winbond, when compared to the Hynix. Stability, speed and so on, the Winbonds blow my other sticks out of the water. They do definitely need more voltage though.