and to offer some advice on the Raptor....
honestly I love my #0001 raptor but the hr-2 goes head to head with her. the hr-2 is amazing with ANYTHING while the raptor becomes craptor with my sensa's (and 2 or 3 driver iem Should have this)..
the hr2 truely stand face to face in SQ the Raptor will beat it using some Senn's and the raptor sounds great with grados and At's but....
the hr2 is great with senn's and amazing with Grados (actually its just a love/love relationship their and since you have the iem's dont think about the raptor..actually stay away from tube amps alltogether..its a no can do...kind of like you powering speakers from a headphone amp. the reason is all 2 or 3 driver iems use a 4ohm driver for the highs..tube headphone amps can not drive the highs..
rolling tubes is fun and so is opamps, though there are more tubes to choose from but!......the hr2 is always on and there is no warm up time so any moment its ready to go, unlike the raptor needing a few mins to give a decent sound..
if I had to choose to let go of every RSA amp i own (hornet,sr-71,hr2,raptor,xp-7, b52) and keep one only for headphones it may be the xp7 with power supply just in case I need portable but if I dont its the hr2!
of course I have no plans on getting rid of my two number one products (#0001) the raptor and the b52!
i have not done a comparo against the hr2 and b52 yet as i am still sort of sick and alittle to new to the b52 just yet.
in other words forget about the raptor, you have a beast of beast's there now...just buy more cds and enjoy your music.