Hotchkiss is pretty good stuff, but I don;t think they make an RS front sway bar, and you can't use a WRX one. But, for $600, you can still do some good things. I'd get a few things from Whiteline (oh wait, I did...
) such as a rear sway, solid endlinks, mounts, springs, steering rack bushings, rear subframe lock bolts, and maybe a rear strut brace.