I'm a lefty too and I know what you mean but in my opnion, if they don't have a bow for you to shoot, go somewhere else. The bows you mentioned are all top notch bows and a good dealer of any one of them will have those mentioned in stock. Generally good shops will carry the top models in left handed and skip the rest.
This might not be the best time of year to be looking for a bow. Hunting season has started, hunters should have there bow and most buy in the spring or early summer when the new year models come out. Bow shops aren't restocking right now. If you find a bow shop with a lefty that you want, chances are good you can talk them down in price. They hate getting stuck with left handed bows.
I would never spend that kind of money with out shooting that make and model set up properly first. You cant tell what a 70 lbs draw will feel like in a 50-60 lbs bow even if it's the same make and model. I made that mistake, the bow shop had the 50-60 draw and ordered me a 60-70 draw and I hated the difference, the draw cycle was totally different. That was a Hoyt.
I'd add a few more bow to the list also like PSE Xforce and Parker Frontier and Hornet. I traded my Hoyt Xtech for the Parker Hornet and love it. I added the STS to it and have 1 quiet little bow.