Who cares? My peg leg tranny stood up to an STI even though I had to play catch up until 3rd. LOL
On a serious note the only place it makes a real difference is on the track, or SEVERE weather conditions (ice, snow, mud.... but youll want AWD for that LOL). If you're not going to be a regular track racer then it's no where near worth it.
I like my non LSD on the road courses. At the auto X you would probably want LSD so you dont have to learn to modulate the gas. Once you do learn it though the benefits going from a non LSD to LSD equipped car will be somewhat better.