Price Range: $1500-$2000

CPU, Bus Speed, Motherboard Chipset by Quarter
• Q4 2000: Pentium III 933MHz w/133MHz FSB and i820/E/i815/E chipset
• Q1 2001: Pentium 4 1.4GHz w/400MHz FSB and i850 chipset
  Pentium III 1GHz w/133MHz FSB and i820/E/i815/E chipset
• Q2 2001: Pentium 4 ³1.7 & ³1.5GHz w/400MHz FSB and i850 chipset
  Pentium III 1.13GHz w/133MHz FSB and i815/E chipset
• Q3 2001: Pentium 4 ³1.7 & ³1.5GHz w/400MHz FSB and i850/Brookdale chipset
  Pentium III Tualatin Introduction 1.26GHz w/133MHz FSB and Almador chipset

Mainstream 3 and Mainstream 2 are usually where the sweet spot is for price versus performance.

Price Range: $1,200-$1,500

CPU, Bus Speed, Motherboard Chipset by Quarter
• Q4 2000: Pentium III 866 w/133MHz FSB and i815/E chipset
• Q1 2001: Pentium III 933 w/133MHz FSB and i815/E chipset
• Q2 2001: Pentium III 1GHz w/133MHz FSB and i815/E/Almador chipset
• Q3 2001: Pentium III Tualatin 1.26GHz w/133MHz FSB and Almador chipset
  Pentium III 1.13GHz w/133MHz FSB and i815/E chipset
  (late)Pentium 4 ³1.5GHz w/400MHz FSB and Brookdale chipset

Mainstream 2 will not be seeing the Pentium 4 anytime soon.