I want some OWB leather for my Steyr GB (if the gun smith can make it fire properly). Luckily, I know a good local holster maker who will hand bone a holster to my gun. He made a nice one for my CZ SP01 Phantom for $75.
My Sig P230 gave me some trouble when I was trying to find a holster for it. Several companies claimed to make holsters for it, so I would order them, and when they came in, it was obvious it was a generic holster that fits several guns.
There was a company locally that made Kydex holsters, so they used my 230 as a mold, cut me a deal on my holster, and used the mold to start producing holsters for the 230. They are out of business now though.
I don't own one yet, but I've been eyeing the Beretta PX4 subcompact in .40. I'm a Southpaw too, so holster options seem to be pretty slim for my needs w/this one. I may end up going w/an M&P40C if things don't pan out for the Beretta. I know you should pick the gun first, but being lefthanded means extra consideration may have to go into the purchase.