I had a DC2 SR3 seats on DC2 rails in my EJ and to me it felt absolutely perfect. I had to modify it a bit(cut, weld new piece and drill a hole) in order to bolt it properly. I much prefer the OEM seat rails than any aftermarket rails.
P.S: I have never tried any other seat rails for the SR3 Recaro, but the hight, movement and overall experience was great and I never felt that I have to change it for any aftermaket seat rail. Unfortunately can't say the same about my bucket seats and aftermaket seat rails