hehehe the question of which brand and which one is good very subjective when it comes to coilovers ler. some user may find brand x,y,z good. some may find brand a,b,c good. so when some one says this brand a,b,c not good. u need to ask them, base on wat facts? i have heard ppl saying tien is not good. when i ask them y? they answer, coz its f**king bumpy. i just roll my eyes ler and ask him, so ur judging whether a coilover is good or not based on the bumpyness? :)
so for u as the owner/driver of the car. take a drive in friends car fitted with whichever brand that u intend to buy. then see if u like it, and whether its within ur budget. then if u find it too bumpy but u like tat specific brand. u can always revalve it or maybe choose a different spring rate ma. but the most important thing while choosing a coilover is, ask urself wat u want from it. if u are a track kaki, taking lotsa nippy corners and willing to sacrifice comfort. then maybe u can go for mono-tube ones. if u want a 50/50 of both worlds. then twin-tube is a better choice for u. but then, a twin-tube from brand x can be more bumpy than a twin-tube from brand y. so :) happy choosing la :)
but if u say ur budget is 1.8k, i think u can go for apm,rg,hwl,mines(same company as hwl, rebadge), gab local, etc. and if ur fitting it on a satria, i think 5kg front and 3kg rear for the spring rates is good. hehehe, my personal oppinion la :) u can try diff spring rate and suit ur liking ler :)