I've found the 1.5 LSD to be an excellent way to help reduce wheel-spin. I've played with the fully customizable, but I've never found that I actually needed it so I just use the 1.5. Since I don't use TCS at all, I'll usually put the 1.5 LSD in anything having a serious issue lighting up the tires. Made a huge difference in my '54 gull-wing, which, when fully modded, would burn the tires off through the first three gears.
Also, don't be too tempted to set your first gear too low. If you can't keep the power on the ground, it doesn't help. A tall first gear is fine for vehicles with lots of torque (Ford GT, Viper, etc), but death to low-torque vehicles (Lotus Elise, Opel Speedster, etc). If you've got enough torque, keep that first gear tall and you'll probably be happier.