Hey guys, not sure what's happened to my previous username... no longer works for some reason. Anyway onto the issue at hand! Optional reading Bit of background: I got my Senn HD600s back in 2004/5 for a song off ebay (Actually at the recommendation of people from this very site) and I eventually went on to buy an amp - it was only a small thing, a custom made job off of ebay. I've been listening to this set up with both a laptop from the audio jack and an ipod for the past 5/6 years and loved it. Main point and questions Recently I let my flatmate try my amp on his HD595 and he then asked to try my HD600... and to my shock he preferred his HD595! I listened to a mixture of dubstep, hiphop, metal, acoustic and instrumental guitar... I could see why. On the 595s, the sounds were more distinct and clear - there was a slight muffle which my ears picked up on comparison between the 2 which was barely present on the 595s. Overall, The amp I had bought drives the 600s well but nowhere near what I've been led to believe their full potential is. It drives the 595s very very nicely though. Anyway to stop rambling, I've decided a new amp is what's in order for my beloved 600s and to this end I'm now here with a plea to you lovely folks to help me as you did before in choosing a nice amp. Criteria: I love bass in all my music. I like clarity of sound (for example I love hearing the squeak on a guitar string on an acoustic tune, and I like different levels of sound to be distinct - I love listening to a tune for the 100th time and noticing a sound or backing track I never really noticed before) I like customisability and control but too many knobs and dials and I'm like *** do I do... I listen to a lot of guitar music including instrumental (e.g. buckethead) acoustic, metal (including death/heavy metal) and I want to prioritise this aspect above all else, though if it's good for dnb/dubstep and hip hop I'm happy to take those into the equation too portable/desktop - don't mind which as I won't be carrying it around much anyway (although portable would be useful since I do walk around my flat with my headphones on when I'm using my iPod) Max budget: £300 +/- £50 Extra info I realise finding the right headphone/amp combo has a lot of room for speculation and personal subjectiveness. For this reason I also request info on places in and around London where I could maybe try different amps (or even stock them...?) or audiophile specialist shops or similar in which I would be allowed time to make a purchase only when I'm completely satisfied. If you've read this far thank you so much for bearing with my rambling and thanks in advance for any and all suggestions!