That stuff should all work together, but check and see if you can get a newer revision of that Athlon 3500. The Newcastle is the first release, and has been replaced 2 or three times. See if you can find a Winchester, Venice, or San Diego (if they made 3500's with San Diego) version. Venice is probably the best revision available, but if you can find a San Diego, snatch that up.
Also, IIRC the Asus A8N-SLI Deluxe is plagued with problems. Save yourself some headaches and get a different board. If you want to use SLI, the best board on the market for socket 939 is probably the Asus A8N32-SLI Premium. Keep in mind though, that two midrange graphics card (like the 7600's) in SLI do not perform as well as a single high end GPU (like the 7900 or x1900) and they cost more in total. If you don't plan on doing an SLI configuration, don't bother paying extra for an SLI mainboard, save yourself some money or upgrade another component.