I recently treated myself to a pair of AKG K-701s, partly because of the reviews and partly because of the looks. They put my speakers and amplifiers to shame, frankly. I love the things and was hoping to get more from them The best source I have here for them is a Marantz CD7300, and plugged into that with a good disc, they sound pretty bloomin good to say the least! But there seems to be a lack of power to them at times, so Im wondering what my options are. I know nothing about headphone amps, other than Ive seen a few Creek models about that get decent reviews. Ideally Id like the option of a digital coaxial input along with analogue, so I can experiment a little, Im just a bit scared of the cost of what Ive got myself into, so any good second hand options would be appreciated. I listen to a whole range of music, but Im after something that suits the headphones more than anything and gets the best from them... as cheaply as possible... Any thoughts?