I own a G-32, 357 SIG. I find it to be a pleasure to shoot and I haven't had too much of a problem finding the SIG ammo.
I also invested in a 9mm Storm Lake barrel and G-17 mags. I have a Lone Wolf 40 S&W barrel on order (the 40 cal and 357 cal mags are the same) and I have an AA 22LR conversion kit on order.
For a total investment of around $1000 I will have the equivalent of four pistols.