I'm building a '90 Civic Si ITA car so the greater speeds may make me reconsider.
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Yep. Having run an ITA CRX Si, I can say that my car was eating front end components running 90 minute ECR's. I believe this was almost entirely due to the heat put into the braking system during these longer races. After a series of ball joint and front bearing issues, I dropped back to just running sprint's and haven't had an issue since.

As far as which hub to use, I've had ZERO problems with my OPM hardened hubs. I'd suggest giving them a call and ordering some from Tiffany or Tom.

Christian