You might wanna consider going with a Conroe Ready board so that if you decide to upgrade 6 months from now for huge performance gains you can do so without incident
or P5B Deluxe
The Deluxe and DQ6 are higer end boards, and are more expensive than the DS3 and The P5B, My recomendation would be the P5B Deluxe
Edit: You may have to change your power supply at that time also (Especially if it's no name like the one in the Guide)... but that depends on what you choose now. It's never a poor choice to plan ahead with future proof technology.
Finally i will add that you can get much better deals for better parts than listed on there. for example the RAM and the GFX especially.
My suggestions really would be not to folow a guide thats that old, and instead to do an little reading and ask for some advice and ppl here can guide you to building exactly what you want with your budget.
Let us know if that helps!