http://cdnninvestments.com/sights.html Here are mecgar sights. The target sight sets use a tall front sight and the rear sight isn't low profile either but they have a good sight picture. The low profile models use your existing front sight. These prices are very good. Mark
LPA makes two different drop-in replacement rear sights, some of which are availabe at that CDNN sale. You can see the models at www.precisionsights.com . You can also have your slide milled for the low-mount style.
PT nights and MMC are the choice for CZ'ers. The MMC's are adjustable and both are very reasonable...I just put PT's on my PCR slide (still in transit, aarrggghhh!) and its was very reasonable. Check them out....
Shoot well