I'm a novice firearm owner, but I'd shy away from any non-common caliber like .327 and get the .357. It's going to be a lot easier to find ammunition and I'd expect it to be less expensive. For example, I did a quick comparison and the .357 selection is much bigger and it's less expensive (see the american eagle 50 round box of soft point.
327 FEDERAL MAGNUM : Ammunition To Go
Jacketed Soft Point Ammo : Ammunition To Go
And when was the last time you saw someone with a 32 s&w at the range.