Motherboards

I'm planning on upgrading my current PC with new mobo/CPU, video card, & RAM. (Power supply too, since I've discovered PCI-E uses a special 6-pin plug.) I've narrowed my mobo choices down to 3, and would like to know which you'd recommend and why. PC apps will be mostly web surfing & high-end flight sims such as Falcon 4: Allied Force, maybe some FPS. My choices are:

http://usa.asus.com/products4.aspx?modelmenu=2&model=1031&l1=3&l2=11&l3=0

http://usa.asus.com/products4.aspx?l1=3&l2=15&l3=268&model=1042&modelmenu=1

http://www.abit-usa.com/products/mb/techspec.php?categories=1&model=298

http://www.abit-usa.com/products/mb/products.php?categories=1&model=313


Basically I'm looking for something that will (or should) go at least 3 years without needing a major upgrade. My current PC is built on an ASUS P4P800 mobo w/3.06GHz P4 and has done pretty well for the 2 1/2 years I've had it but it's not quite up to speed for sims due to the GeForce FX5200 card and I figured that if I'm going to upgrade I might as well upgrade to PCI-E. I know very little about AMD CPUs other than they work more instructions per cycle which makes them faster than an Intel chip of the same clock speed. Asus and Abit seem to be the mobos I see mentioned most often when it comes to building systems.