I'd like to pick up a decent enough headphone amp for 3-4 phones. Cheaper is better, cause I could just run some off the board but I figure it'll be easier with a standalone amp. At least for any more than two people tracking at a time. A while back I was looking at a samson rack unit. Don't remember the model right now, but what are some suggestions or experiences you've had with different gear? Anyone getting a mix off this amp will likely be playing along with live drums in the same room (most likely via direct in or maybe with amps going too) or at best outside of the room in the hallway.