First off, if you go with LG775, which im guessing ur doing, its much cheaper than a 478 board.
Second, make sure your board has Crossfire (ATI dual video cards) or SLI (nVidia dual video) so you can upgrade your video cards easily in the future.
Third, for now, make sure you go with a board that suppports DDR2-800 and has 4 slots, for easy expansion from 4 to upwards of 16 gigs of ram, just so you are ready for vista.
For motherboards, i would suggest Asus, MSI, or Gigabyte.
I would suggest this motherboard.
http://www.newegg.com/Product/Product.asp?Item=N82E16813131589
i realize you wanted a board cheaper than 200, but take into account the fact that a cheap board will be horrible in the long run, and you always have to consider what will last longest and save you the most money in the future.