I would definitly go with On Scene partly because Eric is a fellow canadian but also I have one of his sheatrhs for my CRKT Sting and it is shockingly good.
It came with both IWB and a dedicated belt sheath. Another good choice is Leatherface I have a SS4 sheath coming in the mail from him and plan to do a comparison a sort of battle of the sheath makers. The spec ops are nice but are not good for concealed carry.