WHATEVER YOU DO DON'T GET AN AN7 (yet)!!! The AN7 has HUGE issues right now due to it being in it's first revision. I mean, look at the NF7, this is it's 3rd revision and they still have problems with somethings. For the AN7 things range from uGuru being ubber gay and not working right to no sound at ALL to poorer performance than it's sibling NF7. Just don't get an AN7, and the uGuru isn't even worth it, it takes the fun out of overclocking it manually .
And on a side note, the athlon will smoke the celeron out of the water. Pure and simple. Hell the athlon will probably beat the P4 of same speed (non celeron).