I'm relatively new to the head-fi forum, and I'm beginning to look at how I can enjoy my music on a higher level. A few years ago I picked up a pair of Sennheiser HD 203s and I was immediately blown away by the difference in comparison to my more generic headphones. I'm considering either upgrading my cans or perhaps putting that money towards a headphone amp - but I'm not really sure what I should be looking for. Can someone explain to me the benefits to using a headphone amp, especially with regards to computers and portable devices (e.g. tablets/smart phones)? I've just begun to look at DACs - does it make sense to get a DAC and Amp combo, or would an amp by itself be enough of a difference in sound clarity/quality? I was considering a DIY amp - perhaps the CMoy - just to see if I liked the change. Would such an inexpensive amp provide some sembelence of what I can expect with a slightly more expensive amp?