suspension ? please help

Hey guys and gals my g/f wants to get coilover for her 96 eclipse rs and she says shes only going to get struts in the back but i tell her she needs all 4 but her dad is a teacher at UTI and he doesnt seem to think so i tell her shes going to blow the strut and its going to ride really hard. i told her it would be like 400$ for coilovers and struts but she doesnt seem to think so she wants to get cheap brand coilovers which i think is a big NO to get cuz they slip out of place and have bad threads. my buddy paid 700$ just to lower his civic and that was just basic shit so if u can tell me or even her if she reads this if she needs all 4 struts how much is gunna cost and maybe anything else likea camber kit n e thing necesary and not get cheap about it.and oh she has 17" whees with a rather nice size tire . Thanx everyone i apreciate it.


p.s. any brands of coilovers that are good or have had good experience with would be geat