The Klein needs so many things. Cassette, rings, chain, shifters, all cables, brakes, and tires need replacement. Bike shop gave $400 estimate for those. Front shock does not work at all, and quick release on both wheels are corroding. Frame seems OK, but is missing quite a bit of paint. Fixing everything starts approaching the cost of a new bike - the Raleigh Cadent I8 is $700, for example, and is designed for commuting.
I'd rather list it on Craigslist or ebay for someone else to restore. It was great for mountain bike racing, but I don't do that anymore...