All I will say is don't spend too much money, even a mini-ITX atom board can be used as a core. Personally I only use mini-ITX boards as MDs though. My core is a "normal" desktop.
My core fried not so long ago as well, and I bought the cheapest dual core CPU and cheapest 2 gigs of RAM I could find. For the motherboard, I needed a full ATX board with x3 PCI slots (as rare as rocking horse shit) - I notice that the one you're looking at only has two, which might limit you. I have x2 Nova-T-500s and the second NIC of course, so the extra PCI slots are very much needed in my case. That said I'm sure there are PCIe NICs you can use, but I fear change.
Just bear in mind that with a modern motherboard, you might have to fart around with the onboard NIC a little bit to get it to work. For this reason I would try and make sure it's Realtek, and this seems to be what most people have. Just bear in mind that some Realtek PCI NICs won't play nicely with their onboard brothers, unless you are able to hack the drivers/modules about. Not sure what your expertise is, but I was certainly out of my depth with this.
Cheers,
Matt.