Dumb Head Phone Question

I own the HD 700s by Sennheiser and like them very much. I also own AKG 7XXs and K701s in the past. They all sound very good using dedicated headphone amps. They aren't terrible using built in amps, like the from Oppo or other gear they just sound a lot better with the headphone amp. It is up to you to decide how much you want to spend but you really don't need to spend a lot to get decent sound.

I own a lesser model of Bravo but can attest even the Bravo V2 (also a one tube design) sounds unbelievably good, even in comparison to my SinglPower Extreme! And they cost about $80- honestly its good.
If you want what the Head-Fi community is excited about get a Garage1217 Project Ember.