I've been looking at suspension and springs for the legacy and have decided to try the 'Lotus' school of thought where you run softer springs but stiffer dampers, essentially this is what the Spec B runs as std.
If you really want to confuse yourself,
http://www.optimumg.com/docs/Springs...Tech_Tip_1.pdf
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2005 Spec B 6MT - KiDO tuned (~270Bhp)
Custom exhaust - Cosworth filter - Samco Intake - Tints - Bilstein B8/B6 & STI springs - SuperPro ALK - Whiteline positive shift kit, rack mounts, rear adjustable camber bushes, front ARB mounts & strut brace, 20mm rear ARB with AVO mounts, - Hardrace Gearbox and pitch mounts - Prodrive PFF7's - Front Brembos - Kenwood CarPlay - 1/2 carbon grille - STI front splitter