Well, I'm not sure if you noticed, but the motherboards you linked are for 64-bit CPUs, and the processor you linked is a 32-bit.

I think you're wise to go with a good mobo. Take it from me, having a bad mobo in your brand new system is NOT fun. I had a Soyo that turned out to be total crap, and it's not cool to have to disconnect everything in your machine, RMA your mobo, and wait for the refund before you get a new one shipped to you. Hell, by the time I got my system back together and running for the first time, its value had already depreciated tremendously

I have one more recommendation, though. Actually, it's more like something you have to do: GET GOOD MEMORY. Above all else, you must have good RAM. I went through two pairs until I got a decent set that didn't cause me headaches from random reboots and memtest86 errors.