I have the same gun, i was looking for a paddle holster and i am also left-handed. I fond one and made the mistake of ordering one for a Beretta 92, but with the acces. rail - won't fit.
I struggled to find a holster (again left handed) and finally was referred to Blade Tech (http://www.blade-tech.com). They are pricey, but they make-to-order for each holster. Soyou get an injection molded holster that fits like a champ.I just got mine the other day and it is comfortable and snug. I went for the Paddle Holster and after speaking with Blade Tech and telling them the gun i had - they recommended basing my order around the Beretta Vertec. That is pretty much the same gun as the Taurus version. Do some searchs on the Vertec and compare.