BMC road bike sizing

[mac9mc]

BMC SLR01 Team machine
76.3cm inseam
36.0 thigh length
61.0 torso
57.5 arm length
saddle to peddle 82.2
cockpit combo 66.0
5'4' tall

what size would fit me? bike shop tells me a 50mm

 

[mpre53]

Before I spent that kind of money, I'd want to take a test ride, or at least have the shop put one on a trainer to see what the proper size would be. 50 cm is probably in the ballpark, but I'd want to be sure.