Good deal?

Me and my pop started looking for a new computer today.
We went to circuit city, and heres one of the pcs we found
Emachines somethin or other with:
AMD Athalon 64 3000
512MB DDR SDRAM
200GB Hard Drive
128MB ATI Radeon X200 Graphics card
DVD-R/RW Drive/burner
All of this, with windows XP of course, for 450 Dollars
I thought that was great, but of course my dad wants to look around. Everything else at that price has Celerons or Semprons, so I really want to get that machine to replace the Piece o' S*** that I have now.
I, and my dad, were wondering what AMD processers compared to what Intel processors, as in
Intel Pentium 4 - AMD ?
Intel Celeron - AMD ?
Intel Celeron D - AMD?
We went to circuit city, and heres one of the pcs we found
Emachines somethin or other with:
AMD Athalon 64 3000
512MB DDR SDRAM
200GB Hard Drive
128MB ATI Radeon X200 Graphics card
DVD-R/RW Drive/burner
All of this, with windows XP of course, for 450 Dollars

I thought that was great, but of course my dad wants to look around. Everything else at that price has Celerons or Semprons, so I really want to get that machine to replace the Piece o' S*** that I have now.
I, and my dad, were wondering what AMD processers compared to what Intel processors, as in
Intel Pentium 4 - AMD ?
Intel Celeron - AMD ?
Intel Celeron D - AMD?