Hmm, I was also lookin at the Oz's but I didn't think it fit 4th gen preludes. Does the 92si have a 4x114.3 bolt pattern? What's the offset of your wheel? I couldn't find anything useful at Oz's www site. Heck they don't even list the 4th gen in their fitment guide and tirerack isn't showing it as an option.
I definitely like the Mugen but they're so damn pricey

. I'd probably use 5 different set of wheel locks on them just so someone doesn't jack them.