Listen to the guys above, you definitely get what you pay for. I only go with M/M components, and they've never failed me. I just put my new coilover setup on with M/M Race Valved Bils, and even with a very high spring rate, the ride is not incredibly harsh for daily driving on So.Cal. streets. The quality of the damper and choosing the appropriate valving for the spring rate are key here. Ride quality evaluation is a very subjective thing, however, so I suggest that you ride in a few different setups before you buy. Hypercoil should have a reference table for their springs on their website, detailing amount of compression experienced before coil bind takes place.
Maximum Motorsports 3-link rear, M/M Race valved Bilsteins, 475/350 coilover springs, Torsen T2R, full length subs, 17x10, 275s all around, Powerslot/Hawk HP+, Fluidyne 2 row