I'm not putting down LSD's at all. I recommended the Locker unit because that's what I have. It is rock solid reliable and works great if you want to drag race (which is something that he plans to do occasionally.)
Obviously, if you want to "carve corners," then this is not the unit for you. I can't recommend something for you because I've never used another unit for that purpose.
I built my car for street driveablility with the occasional trip to the dragstrip (same as 69Rcode Mach I) and I wouldn't go with anything else. I wanted to build a car with components that last (my brother's entire drivetrain is identicle to mine and it's been going for 8 years without a single problem.)
I've had mine in the car for two months now and I've driven it for close to 2,000 miles and I wouldn't change a thing.
By the way, I drive my car to work 2 to 3 days per week and cruise in it constantly. The engagement/disengagement of the locker unit doesn't bother me at all.
69Rcode Mach I, I've checked out your link and it looks like they'll have the unit that you may be interested in. If you plan to race it occasionally the 28 spline axles will work, but may be a wink link. I thought this would be the case with me too, so I upgraded to the 31-spline axles (bought them through SUMMIT) to be on the safe side. I bought my locker from
www.drivetrainspecialists.com . You may want to price shop and compare their pricing.
Good luck in your decision making process.