I am looking for the same setup with my DT770/80 also in the same budget. I am leaning towards a Travagan White/Green or Maybe a Fubar III. I am looking for an All-In-One AMP/USB DAC combo from the PC>DAC/AMP>headphones
There are a few options: If you're getting something to use with your computer, a DAC/amp is the go, rather than just an amp, as you'd just be amplifying the crap that comes out of your soundcard, which isn't of much benefit. There are quite a few options though: The Zero (cheap at $99, but not the best quality), the new Keces model (not tried it myself but they have a good reputation) and the Audio-gd Compass which we asked a Chinese company to make as an alternative to the Zero. The latter is going to be $250 shipped once it's ready in about a month.
Originally Posted by Spareribs /img/forum/go_quote.gif If you are new to headphone amps and like to casually enjoy a reputable amp, within your budget you can try the Corda Arietta amp from Meier Audio.
The Arietta is similar to the HeadFive (a special model) that I used to have. It's a good little amp and has a built-in crossfeed filter.
Another inexpensive amp I've heard a couple of times and liked is the Eddie Current Lunchbox which is on sale at $199 right now. If you want to try tubes, this is an affordable way to get into them.
You might also be interested in the Creek OBH-11 for $90 on eBay right now. I started off with one of these and they're not bad, especially for the money. These cost less than most portables, are made by an established audiophile company, and sound pretty good. Since the OBH-11 is powered by a standard wall wart, you will be able to find a power supply appropriate for your country.
If you might like to try your hand at building an amp, Glass Jar Audio has several kits that fit your budget. You'll get the most for your money if you supply the labor and repurpose a case for your amp.
Finally, look through the For Sale Forum here. Lots of good deals turn up and you'd help out a fellow Head-Fi'er if you bought a used one.