It is all a matter of taste. As you can see from this forum, this Intel vs. AMD debate is still going strong.
I prefer Intels over AMDs, but they are both great chips.
Get either an Intel P4 or an AMD Athlon.
If games, 3D rendering, CAD and/or movie making is on your list of things to do with your computer. Then stay away from Intel Celerons and AMD Durons and Thunderbirds. They are meant for non-stress applications, i.e. word processing, spreadsheets, surfing the 'net and the like.
Soyo Dragon Ultra Platinum Edition powered by a P4 3.06GHz w/HT @ 533FSB
ATI Radeon X800Pro 256DDR <---Yeah!!! I finally got it!!!
1024MB PC3200, Creative Audigy LS, 2 x 40GB = 80GB RAID 0
Windows XP Pro, DOOM 3, CS, UT2004, BF1942 RtoR, CNC Generals
Finished Half-Life 2!!!!!!!!!!