Better is highly subjective (there's no "1-10 scale" at play here) - what you like may not be what I like, and vice versa.
Anyways, I like the Grado SR-225 and Ultrasone HFI-2400, which are both around $200. If you have an extra hundred bucks, either spend it on music/food/etc or consider the SR-325. They aren't similar though, and which one is better for you is really dependent on you. I think the Ultrasone are more likely to appeal to a wider audience though, just because of their fit (I personally don't have any comfort issues with Grado headphones, but some people do - and that should be considered).
Depending on what you mean by "unamped," the AKG K701 should also be considered. They're usually around $250, at least last I looked they were. I haven't heard the ATH-AD900 or 900X, but if the ATH-A900X is any indication, they're probably also a very good candidate in this price range.