Which HP laptop is better out of these three?

Between the DM4t Pavilion Series with an i5 intel core, the DV6t Select Edition with an i7 intel core, and the ENVY 14 Beats Edition with an i5 intel core, which is best? I tend to be online a lot, have several documents and a couple programs open at once, edit videos, and listen to music/watch movies on iTunes. Which do you think I would like better? I'm not looking for other suggestions, just which of these is the best. Thanks for the help, I appreciate it :)Which HP laptop is better out of these three?
for all that, just get the one with the most RAM (4, 6 or 8gb would be good)Which HP laptop is better out of these three?
For what you do on the computer you may like the ENVY beats audio edition. You would not for what you do know the true difference between the i5 processor and the i7 processor.