Ok Dats-me correct me if I'm off base here;
But why on earth do you want your car to slide more in the dry or wet? If it's a track car this = slow. If it's for street use this will turn out to be an episode of "car meets tree" rather quickly.(soapbox over)

Now with that said a LSD is the way to go , you have two routes to get one for your car. Wait for a H150 to come up cheap (could be a year or more) or convert to the H165. Price out all the H165 parts and your time. If you can get it done for less than say $1000 then get the H165 if it's over that your 2/3rds the way to an H150, so save the cash up and wait.

Tom