I vote Racing Beat for springs
Here's my put. I'm about to replace the struts and since you have to disassemble the springs at the same time it makes sense to do the springs as well. I've done a lot of research and it really depends on what your goals are. You said "low as possible". That's fine but there will be lots of tradeoffs. It will ride like a rock and you risk hitting the bump stops as well as major difficulty going up driveways etc. Looks cool, I'll give you that. "Slamming" may cause rubbing in various areas as well, making tire size another issue without flares. Eibachs drop just under 2" are are great but also ride very hard and I'd go coilovers with those as well. To spend the money on adjustable ones doesn't really make sense to me unless you do autocross and track days so you can set the suspension for different events. It's a bit of work to adjust them so ask yourself if you really want to do those things. If so, go for it. Since my 3sHB is my daily driver (30Mile commute each way) I want better handling, a bit of a drop but not a lot of extra problems (tire rubs etc). I've ordered Koni FSD auto adjusting struts that got great reviews at Tirerack (on sale as well). I'm going with Springs from Racng Beat. While they don't sell lots of products the ones they do are very well tested so you don't have isssues with them. THey only drop about an 1" though. They sell sway bars that are designed to work with them as well. Good luck on the hunt, its a lot of bucks so get what fits your needs the best. GB
