For the money, the CRKT Companion is very tough to beat. Bob Kasper put some thought into this design. It was meant to be easily carried, either on the belt or IWB. The CRKT sheat isn't the beat, but it is functional. There are several sheath makers who can set you up with a good sheath for it. I would offer my services for the sheath, but don't feel that my skills are quite there to offer you a quality sheath.
You will also find that while it might be heavier than the CS, it isn't a significant difference. I have owned and carried both and would opt for the CRKT.