I like the suggestion (2 posts back) about going Griggs ($$$).
I think they are after a more streetable (not that its rough or anything) but budget seems to indicate that a set of springs/shocks/braces will deliver _plenty_ of smiles.
To make use of the Griggs or IPS (I consider them in the Exotic category) you need to look into race-compound tires. Street tires with race suspensions just dont cut it on the track, and on the street its overkill.
As for the Eibach springs. I had a set. I got their "Street" 450-580lbs. THis was my first spring and was very satisfied. Nice firmer 10% ride, and handling was great. Then I built the t-arm/panhard and needed stiffer springs and went (still cheapie) BBK 650# linears. Now, this spring I am going to Tokikos with 400# (800# @wheel) coilovers.
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Darius Rudis
Home built t-arm/panhard suspension powered by an S-trimmed motor :-)
My Mustang Page