Currently i have the Fiio E10 which is DAC/AMP.
But i feel it colors my headphones a bit too much.
I'm looking for a cleaner sound DAC thats cheap and small(good lookin =P) for desktop.
Do you want an amp with it? If so, take a look at the Topping D100 MK2
Otherwise, there are cheap Sabre DAC's such as the UD100 and Hifimediy, both of which can be had for around $50. The Modi is also out, and first impressions are generally positive. Lastly, there's a super cheap Ele DAC for $18, which is supposed to be decent.
Most cheap amps aren't completely neutral. If you get the Hifimediy, it works as an amp and a DAC. Otherwise, the Magni or the O2 are probably probably among the cheapest amps that will leave the sound mostly unaltered.
I have the Modi, sounds pretty transparent to my ears, although I am yet to have an experience with a compleatly clear reference DAC. If you go that route, i would get the magni with it, they work good together. They would also probably look better than crossing different brands together :)