which computer to choose with Pentium processor

hello they are getting rid of the old computer equipment in the office and i have to choose the computer to take home i get first choice to pick.

-15 inch lcd screen 4 gb of ram core 2 duo dual Core E8400 3.00 GHz dvd writer windows vista/ linux

-15 inch crt monitor with 2 gb ram and pentium 4 2 ghz single core HT technology windows xp

hardisks both 250 GB

my friend is telling me to choose the second one Pentium single core HT because he told me it runs faster becuase of HT technology and cooler and consumes less current electricity so it wont get overheated because it has HT technology so it's high definition for encoding and watching HD movies and HD sound and is like a gaming pc to play internet games.

And also he said the dual core 8400 runs at 3 ghz compared to the 2 ghz so it heats very much because of the two extra cores so it takes more current raising electricty bills and is not good for gaming and watching HD movies and internet flash animations and games because of getting heated everytime.

And he wants to choose and take the E8400 because he has air conditioning at home so it will be safe from heating.

So which one computer should i take is it really faster because of the HT High definition technology and will i be able to play internet flash card games better and watch good HD movies Youtube etc and play all the music and songs.