i need a Headphone Amp to use on my HP G70-111EM Laptop and also to use with an iPhone 4S, an iPhone 5 and a Nokia Lumia 920
i am using Beyerdynamic DT770 Pro Headphones the 80 ohm versions
i am new to this headphone amp thingy
Budget? The V-MODA VERZA is your best bet right now and the simplest.
Then your best bet is the FiiO E07K plus some patch cables.