I have a question about upper strut mounts. Periodically I've been seeing sets of camber adjustable front strut mounts and solid rear mounts going for pretty cheap on Ebay (a full of set of used Tanabe F&R pillow mounts went for about $150 a few days ago). I have KYB AGXs with Tein S-Techs on the car now (as well as Tein tie rods and Nismo steering rack bushings). I basically want the whole car to be as tight as possible, with as little slop as possible (steering that knows where you're going before you turn the wheel

). I figure the Tein tie rods and Nismo steering bushings help with that, as will strut bars, sway bars and maybe an Energy bushing kit, but my question is this: how much will I really benefit from solid upper strut mounts?? This is my daily driver, so I don't want a marginal increase in stiffness and handling prowess in exchange for $200 and absolutely sh*tty ride quality.
Input/opinions?