AMD or Intel

I am currently in the market for a computer upgrade. I am having  a hard time choosing which cpu to buy. My choices are the 1.7ghz Pentium 4, 1800xp, and 1600xp. I will be mostly doing gaming, little video editing, and internet browsing.  I have seen the benchmarks and AMD seems to be kicking Intels butt. But the only thing holding me back is the test on the Memory bandwidth. How important is that in overall computer performance? What applications will it be noticeable?  
If I choose AMD I have been looking at these mobo's Abit KR7A, Gigabyte GA-7DRR+, and Epox 8K7A.
I am upgrading from a Pentium 3 750mhz, 80gig 7200rpm, 384mbPC133, GeForce Ultra 2 64mb DDR, Sound Blaster Live!, 40/16/10 Plextor, DVD Affrey Drive.
Any suggestions would be greatly appreciated.