I carry my SP101 in a DeSantis ankle holster or in a small Bianchi fanny pack. It has an Uncle Mike's bootgrip on it, which is actually smaller than the stock grip, but is very good at controlling the gun.
I generally don't carry IWB, because I've found this mode of carry to not work well for me (I got "love handles" and they don't do well with IWB carry!!).
You'll probably end up doing like the rest of us and buying and trying a number of different holsters until you find what works for you.
Good Luck
Bob