The Saint is a better rifle on paper than the Sport 2 is.

4150 CMV barrel vs 4140 barrel on the sport
1:8 twist vs 1:9 twist
Mid length gas system vs. carbine gas
BCM grip vs A2 grip
BCM stock vs standard M4 stock
BCM keymod hand guard with heat shields vs standard guards without heat shields
M16 BCG vs AR BCG
Upgraded trigger vs standard trigger

Probably a few things I am forgetting. Each individual will have to decide if the different features are worth the money. Personally, if it can be had for around $800, I think it makes a good alternative to the Colt LE6920. But if you don't like the BCM furniture, it probably is not the best buy available.