i just recently got 3 CPU's from a friend. they all work and are all LGA775. but i can't choose which CPU i want

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1.)penty D 2.66/2m/533 with 64 bit capabilities and dual-core
2.)a penty 4 3.2/1m/800 with HT tech
3.)a celly D 2.8/256/533 with 64 bit capabilities
i usually watch videos, download heavy files,emails,games, and other stuff.
my usual OS is WIN XP and/or Ubuntu. please help me choose the CPU.
PLEASE HELP ME!!!!!

P.S. i can sell you a CPU with or w/o cooler if you want.but only the one that i don't choose.
pentium 4 SL7PW or pentium D SL8ZH?