Frame braces and strut bars increase the stiffness of your Subaru, which is a good thing! Increased chassis stiffness means the suspension stays correctly aligned even while under stress. There's really no downside to these braces -- they don't weigh very much and you wouldn't notice any increase in noise or vibration.
We carry chassis braces from Cusco and Whiteline. Both brands boast excellent fitment. Cusco products are often painted in the company's signature metallic blue color.