Bit the Dollar and bought headphones.

Finally went ahead and ordered a set of headphones.  The Focal Stellias are on there way from Moon Audio in North Carolina.  A headphone amp is next.  I’m currently using my CD players, a Marantz headphone amp.  There’s a Sim Audio headphone amp with dac I’m looking at advertised here on Audiogon.  I know I’ll want a seperate dac also eventually.  I’m tempted to buy a discreet headphone amp and use the dac in my Cambridge Audio universal disc player for now.  The Sim Audio Moon is very nice and just within price range used.  I was looking at a Woo and Rogue, both tube.  I’m split between the Sim Audio and the Woo 22 v2 and Rogue Audio RH 5. I haven’t gotten any feedback on the Rogue.  I’ve gotten feedback on both the Sim Audio and the Woo so I’m thinking one or the other.  I do realize I’m comparing solid state with tube.  Please give me feedback on the sound characteristics of aforementioned units.  Interconnects come after the amp.  Suggestions are greatly appreciated.  I can not afford a penny over the price of aforementioned amps so I’m limited to about 2500 for the headphone amp.  Other suggestions are greatly appreciated.  Used is obviously an option as I’m looking at entry reference level. This will be an endgame headphone amp for me unless I win the lottery.  Thanks.