Just another thumbs-up for Bilsteins. I run them with the FMS-C springs (and a bunch of other stuff) and love the ride. It's firm, but that is my preference. I believe the FMS springs are actually made by Eibach, but hear nothing but good things about the H&R's, especially if you get a matched set. Also try
www.shox.com for good pricing!
KYB's are bottom of the barrel - you get what you pay for! Haven't heard a thing about the KYB adjustables though. Koni's are up there with the Bilsteins (they both have lifetime warranties too!), just depends on personal preference. Tokico's are decent if you get the adjustable (at least that's what I hear), but I prefer to not have to fuss with the adjustment and let the Bilsteins do all the work! FWIW, the OEM shocks on the Fox-bodies are also made by Tokico for Ford. Hope that helps!