I realise I am probably out of place compared with the rest of you audiophiles, but please, bear with me here. I got an incredible deal on the AKG Quincy Jones Q701's and I instantly liked what I read in reviews about it's super clean, amazingly accurate sound.
I have already updated my music collection to FLAC. These headphones will primarily be used with my HTC Sensation XL (eyeballing the iPhone 5 whenever it arrives), but also on my PC. PC isn't a problem as I have a semi-decent sound card with headphone amp built-in and it drives these headphones enough for me - the sound is fantastic, though it's not quite as good an experience as on my phone.
I have never used a portable amp so I have no idea what I'm after, but I do believe it's what I need to drive these headphones closer to what I know they are capable of - I hope you can help. I don't have a hard-set budget but I would be comfortable spending £50-70. I would like something small enough to fit in a pocket, preferably alongside my phone.