Heh-heh. Just gonna play devil's advocate here, so sorry CJ.
As much as I love my Teins, I'm also an advocate for each person getting what's most suitable for them. It's a category in which I believe the phrase 'to each their own' applies. What may be perfect for one person may not be suitable for the next. A lot of people are specific about what brand they go with because they are very picky and specific about what they want from their mod. It's just like cars, right. The Subaru Liberty is a great car, but not everyone is going to get one because it's just not suitable for them even though they can afford it.
Anyway, first of all, go with coilovers. From what I read about your specific requirement for ride height, this is the only way you'll be happy. Because I too thought I would get the lowest springs possible to achieve the ride height I was after. But even after lowering 4 cars on 10 different sets of springs, I still wasn't happy until I made the switch to coilovers. I am very picky about the ride height. Either the front gap is too big compared to the back, or the overall appearance is not what I expected.
With coilovers you get what you want. Plus you want to lower it some more to see what it feels like? No problem. Ride too rough and you want to go back to the previous height? No problem. Try that with springs and you'll either have to get a new set each time or you pay for resetting the springs (heating up the coils) over and over again. Not good for the integrity.
Secondly, if you're not planning to track the car or do anything too wild, and your Lib is just like mine in that it's 'street spec', it's ok not to get the top brand. Like Subie Boy, he just wanted it lowered to a specific height, put on some bling wheels, and look damn good while cruising. The K-Sport provided that and kept him within budget. Yes, some people hate the lesser brands, but they do fulfill a segment of the market not looking for top notch. Plus if they were as bad as people say they are, they would have gone out of business a long time ago.
And lastly, take CJ's advice and get a good and experienced installer. Nothing worse then bringing your pride and joy to a garage only to have the guy say "Wow, never worked on one of these before." Next!!!
Good luck. Just decide what you're looking for in this mod, and ask those specific questions to the people who have the product you're thinking about (ie- ask Subie Boy about how low he went, the ride quality, noise, any mechanical issues, and overall handling).
