I always stick with the OEM LSD after my gear swaps. Unless it's gonna see strip duty every weekend or something. There are plenty of N20 and supercharged beasts running on OEM LSDs.
I would buy them if my car is a Gt because they have t locs for about 120 bucks. but my car is a v6 which is 7.5 and the only ones i can find that are for 7.5s are at least 200 bucks