OK Arthur--I'll have to start with the dubious assumptions that your budget is south of $100 (the U.S. price of the 700) and that U.S. prices translate directly to prices in Brazil.
Cans that will work unamped from a computer & that have good bass, but are also balanced, include the CAL! and Shure SRH 440. Both have more bass than the AD700, which is bass light. The AKG K 240 Studio and Superlux HD668B may also work, but they are a bit harder to push than the other two.
Once again I’ll mention that headphone comfort is a very individual thing. We can point you to headphones that are generally considered to be comfortable and mention others that have garnered complaints for being uncomfortable. However, the only way to know for sure is to wear them yourself for a time equivalent to your longest listening session.
So your suggestion is Shure 440 or AKG K240 Studio, right ? Here in Brazil, Shure costs about R$450,00, what is much more expensive than 100 dollars. And the AKG K240 Studio is about R$420,00.
Razer Carcharias is a headphone gamer, right ? Is it "that bad" that i cant buy ? Cause here, in Brazil, it is about R$360,00 (closer to my budget xD). I don't know how import from eBay. I dont know the prices and rates.
Edited by AG22 - 2/10/13 at 2:47pm