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?
That computer wont' handle fs2004 or any current generation game. DOn't get me wrong, its a great deal for a comp with its specs. An athlon64 is much better than any Celeron or seperon. But still, don't exspect any 3d performence from any current generation game.
The video card is much to trashy to do anything. You'll have to replace it. You might want to upgrade the RAM as well.
Here are CPU specs:
Intel Pentium 4-AMD athlon 64.
Intel Celeron-AMD seperon
Intel Pentium 4 EE- AMD athlon64 FX
Intel Pentium D-AMD Athlon64 X2
Now the celoron D is a special. Its a dual core chip, but its performence is severely hampered. Try to aviod celerons. BTW, AMD has no equivalent cheapo diet dual core.
The celeron series and seperon series are diet CPU's. Their cache and soemtimes bus speed has been reduced. Aviod them as they offer inferior performence.
Unless you do video encoding (or the like), stick with AMD CPU's.