BeCool, and strange have some pretty nice stuff, but I have no experience with adj. shocks. This car will be street driven, taken to the road course, and the 1320 track on occasion. Rest of the suspension is all Global west with Hotchkis 1" drop springs.

Koni offers excellent adjustable shocks.

What is the advantage of 90-10 valving? Is this strictly for 1/4 mile use?

Strange 9-way adj. shocks work well.
QA-1s are good too.

"Reasonable" Budget: Varishock QS1 (single adjustables) or QS2 (double adjustables). Aren't going to do much better until the $600 per shock price point. The QS1's are about $160 each and the QS2's about double that. The Varishocks are much more consistent in terms of damping rate than the QA1's.

More money: Custom Koni, Bilstein, Penske, Ohlins, etc setup for your specific application and chassis. You're looking at anywhere from $500 to $3000+ per shock depending on how good of a shock you want with the above brands.