[PunX]

I can't go all way with advice here, but i may shed some light into your mind.
some brands are unknown for me, so i'll rather go with what i do know.

keeping drifting in mind(also fan and event attender), I ordered BC racing cheapest ones. My policy was, any height/spring preload adjustable strut is better than stock. and they were cheapest and best quality price option available for me.
But i'd consider following points.
In Drift, heat in wheel chamber is not usually a problem, tire does get hot, but air is very good isolator and heat rearly travels to rim and to suspension this way. Front is completely other thing, because Catalyst will heat up everything on right front corner.
Keeping this in mind, i picked 200-400 bucks saving and didn't go with upside down monotube, and even more with leaving external oil housing.

ideas on your picks

2) Tein (Street Flex or Flex Z?) - i left those aside because of price
3) ST - also price difference with BC was about 2 times. It's sub company for KW, camber plates may not be in set.
4) BC coilovers - ordered those, all in package deal, camber plates, uniball mount, everything with a cheap price and reasonable quality, also, springs are really cheap and all parts available as spare for rebuild, been told that KW parts are somewhat harder to get, may be local problem in my country. Also wide range of spring stiffnesses, i picked 6/4 because HKS has same set, so it must mean something.
6) HKS HIPERMAX MAX IV GT (from Japan + cheap RLCA) - expensive all around, HKS does make super products, but as Cusco, brand does play a role in price.
7) CUSCO Street ZERO A - expensive considering shipping, if you get them shipped or locally, go for it.

for most brands, they first give you struts and afterwards you can go with additional accessories, do keep that in mind, not all coils come in install ready set and some may leave you hanging with stock parts. including top mounts not in set, camber plates not in set, bushing here or there not in set.
I loved BC racing deal, because the cheapest option included everything you'd need for start up and is monotube. next price option was reversed or upside down strut and third added some diameter and external oil housing.

Overall to sum up, reliability and price are pretty much key here, I went with cheapest option with some quality in it( most motosport teams use BC racing here in eastern europe/baltics). Drifting is hard for suspension, so quality and some adjustment possibilities are a must, but things do wear in time and use, so i considered also rebuild options. Even if you decide to change them in future, rebuild option gives them good aftermarket value if this rebuild is reasonably accessible(part available and not overpriced). And i can't stress enough, check what comes with a package, and consider what it would cost extra to order separately(eg camber plates for proper -3 or -4 camber in front, pillowball mounts, top plates, bump stop bushings).