I have used Maverick for a couple of pieces. I have found they have great customer service and are very honest about the flaws a piece may have. I bought one piece from their closeouts which was exactly as described on the phone, a piece in the middle was very damaged but the price reflected that. I bought Horween Austin and it was very good. I just received some strips and they look to be great as well. I have even bought two double shoulders veg tan that they sell (not Horween) and they are nice too.
My advice is call them, ask plenty of questions if you have them, and you can even make recommendations. For example, I needed 50 in. in length for strap so I asked about two pieces of leather, and they led me through the options and even searched for a piece that was the right length and less flaws.
Best of luck!