I did look into getting a separate DAC/AMP setup before I got the Xonar STX and was close to getting the FiiO E09K/E17 package, which soundwise is pretty much equivalent to the STX. Trouble is the separates worked out a fair bit more expensive and the clincher was that the speakers are not switched out on the E09K when you insert the headphones, so I would either have to keep turning my speakers off or pull out the plugs every time I wanted to use headphones. With both the STX and the Soundblaster Z before it, I just had to change the output in the software and that was it, done. In the end, OcUK had a £15 off sale on the STX, which is back on again I believe and I picked one up for £120, which is a lot cheaper than I would have to pay for a decent external DAC/AMP combo.