Re: Options beyond the limited slip...
You've got lots of choices, depending upon budget and intended usage.
The factory Gov Lock is an interesting piece of hardware. Some swear by it, others swear at it, some make it go boom. I personally find it annoying because you have to have a difference in axle shaft speeds for it to lock up, and the lockup feature disables itself above 25mph once you let off power. It's a choice, and probably the least expensive.
There are a number of clutch type limited slips available. The Auburn (as was used in '93 to '96 LT1 Camaros) uses cone clutches, but there are also plate type clutches available. The aftermarket has many choices. These work well in many applications, but clutches wear out.
There are the gear type limited slips (Zexel Torsen / Detroit TrueTrac). These don't have clutches to wear, and do a great job of spreading the torque to the tire with the most grip, but don't work so well when 1 tire is off the ground or on a surface with absolutely no resistance (glare ice for example). These were available from the factory in LS1 Camaros. An HD version was used in the SS camaros (had a higher torque bias, among other things). The TrueTrac is similar in function.
Lockers and spools are also available. Personally, I think spools only belong in dedicated race only vehicles. But, your opinion may differ. Lockers are fine for off road trucks, and do a decent job in other places, as long as the ratcheting action doesn't bother you.
Ultimately, they all have their place. You need to decide what your usage needs and budget will allow.
Oh, and if you start making big power, you might think about upgrading the whole axle (maybe a 8.5" 10 bolt / a 12 bolt / 9" etc), or at least installing some form of axle retaining device. It isn't good to be passed by one of your rear axles while making a pass (there's a pic of Ed Hess in that exact situation). C-Clip eliminators or a disc brake conversion that captures the axle (vs drums which won't) are both things to consider.
'JustDreamin'