Not a terribly useful question IMHO. OK, so you might inherit some legacy code, but hopefully most of us don't use any of the 'non-ansii' options any more for new code (if we ever did).

As for the option about performance relative to SQL2000 - that's an 11-year-old unsupported version, we're not far off the day when SQL2005 becomes unsupported so what's the benefit of learning about its predecessor!