The list of asus motherboard you provided all use socket 478 cpus, which intel is in the process of phasing out. If you buy any of the motherboard you listed, you might find yourself having difficulties finding compatible socket 478 cpus to use with the motherboard. In some cases, the older socket 478 cpus are more expensive than the newer LGA 775 socket cpus. I suggest you get an LGA 775 socket based motherboard because the newer intel LGA 775 cpus are more common than the older socket 478 cpus.
I recommend getting an Asus P5GDC-V motherboard. Based on the 915G chipset with integrated video and supports DDR1 and DDR2. If you are not a heavy gamer or user, I think the integrated graphics will tide you over until you wait for newer and better PCI-Express based graphics board to come out in a year or so. If you do decide to get a graphics board now, pick one based on an ATI chip since it is more superior when it comes to video editing in comparison to Nvidia. Ati X600XT based video card is sufficient for mid-level gaming, video playback, editing, and HTPC. Ati X300 is the bottom rung model and is sufficient for more mainstream usage (ie. internet, dvd playback, word processing, etc).