I have a Tom Threeperson crossdraw from El Paso saddlery for my 7.5'' Ruger .45. Crossdraw holsters are comfortable when riding... car, truck, 4-wheeler, and you can draw your gun just as fast as strong side with practice.
There may be a better holster maker than El Paso but, they will be very hard to fine. The only constructive criticism I have is that it takes awhile to get your holster, about 4 to 6 weeks, (I got mine in 5 weeks this last time), because they make their holsters to order.