OEM stock MSP/MP3 struts are slightly softer than off the shelf HP's HP's with STechs would be a very nice combo. STech's with illumina's would be better.
OEM stock MSP/MP3 struts will be too soft for stech's, but will be OK to the uncalibrated bum-o-meter. the rear spring perch is also at a different height, so the drop will not be as expected. plus, since buying used, who knows what kind of damping you will get or how much longer they will last.
I tokico hp kit stuts and springs i use to run with tokico springs and i loved the ride i had a nice drop w/o being to low but i sold my tokico springs and now i have some eibach sportlines. My cars been parked for about a yr and a half so i havent run with the springs yet but i did go a tad bit lower with the sportlines than with the tokico springs. Ill find out soon how the ride is once my cars back on the road