well the blitz coilovers are OK, in that they are monotube, not twin tube. But I think they are a generic brand with a blitz sticker on them these days. I have a set in my leaf and they seem good for daily use.
swaybars on the other hand I can't really help. Most cars here use a local brand, whiteline. Cusco is the only jp brand I am really familiar with, they make a nice, light bar but are not adjustable so you have to choose the right one when you purchase
welcome to the world of skylines