Depends on what you are doing. If you are using the machine to go on the internet, download music, burn cd's, write reports and play yahoo! games then get a lower speed celeron, like a 2.6. If you are gaming go with the P4. Remember to search TF before you post questions. Alot has been covered already.
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Specs: AMD Phenom II X6 1095T, Asus M477TD, 8GB GSkill Ripjaws DDR3 1600 7-8-7-24 1T, 128GB Crucial M4 SSD, ATi HD4650, W7, 27" HL272 Monitor