The megahertz doesn't matter, which is why AMD switched to a different scheme. Currently the highest AMD is the 2200+ which means its comparable, if not better than then competitions 2.2Ghz chips. A lot of benchmarks out there show Athlon kicking lots of ass on Intel chips. Check out Tom's Hardware and Arstechnica for reviews.
The AMD chips are stable, a lot cheaper, and quite good. I have quite a few AMD machines, and it will be hard to convince me to switch back to Intel. The Intel chips are way overpriced, and the P4's are only now starting to show promise...the intial p4's were quite buggy, which is why you see people perfering p3's at the same Ghz over their P4 counterparts.
AMD is a great solution. Try it, you'll like it.
--mark
