I'm in the market for a LSD too. I know TurboMike has a Wavetrac. You could PM him what he thinks about it. If you do, post his response as I'm curious too.
As for coil overs, I love my KW V1s even though they don't have camber plates. You could always pick up a set of Vorshlag CPs, though. I think they run in the $200-300 price range.
Glad to see you haven't had any issues with limp mode or over-heating even though you just have the OEM oil cooler. I'm on the fence about whether or not I should pick one up before I go to the track or just wait and see. My oil temps were up over 250F this morning cruising on Angeles Crest (highway 2) and it was 40 degrees up there. I'd imagine any track in the desert would put me into limp mode.
Any videos of you tracking?
Nice car
any pics?