I've actually heard of Asus, so of the two I'd get the Asus one, if you want to go 775, it would be easier to upgrade if you want to do so, but if it's significantly more expensive, it might not be worth it
I have that same 478 and celeron and its no head ache, actually its quite fast! I overclocked it to 3.2 and my friend has a 3.2 p4 with HT and I am just as fast as him in all benchmark test we ran, so if your on a budget you wont be disappointed.