Use the following equasion to determine your next move:
Any suspension upgrade = loss of ride quality
My car is on the extreme end of such suspension mods and is a DD ride. I have a somewhat rougher ride than your average lowered car, but LOTS more noise. I am a bit of a stickler on suspension reguardless of ones needs other than a 100% DD ride with ZERO desire to anything but get groceries! As soon as one wants to go fast, he/she needs to be able to stop faster and be able to carry some of that speed around a turn. Unless you are 100% 1/4 mile launch ride, one really needs to address the rear-end of the pre-S197 suspension to be safe, IMO.
If you are NOT into the corners, as stated in original post, I recommend you go poly/spherical LCA's and FLSFC's. I would recommend you go spherical UCA's as well, because you will be able to better handle some of that speed while rounding a corner. Sooner or later, you will intentionally or otherwise, pitch that rear-end outward and your car will be better equipped to address it. A PHB or WL with a torque arm will be MUCH better for this event, but WILL add just that much more noise to your driving experience. I very much disapprove of the "poor man's tri-link" as it is a short cut that will only tease the driver into wanting more. I have never been in such a car, but have little doubt this would be the result.
Jazzer
