Without seeing the individual prices on your list I don't see why it costs several hundred more than the one I posted. Your list is basically the same except with a cheaper CPU, RAM, and monitor. Yet it costs $319 more.
I still recommend the one I posted. You can change out the monitor, keyboard and mouse if you want but the ones I linked too are all top notch. Samsung makes excellent LCD's (if not the best), The Microsoft keyboard is excellent (I love mine), and the Logitech MX1000 LaserMouse is the best on the market. Plus you can bring it under $2000 by going with 1GB of RAM instead of 2GB and changing the CPU to a 3500+.