The Omega IIs are horrible - I posted a brief review of them a few days ago.
I haven't heard the MicroZOTL, Cary or "Twin head" amps.
The EarMax Pro sounds very very good. It is more "tubey" sounding than the HP4. Both have great bass, the midrange is probably overall better on the EMP, and both have great treble.
The problem with the EMP is its power supply. With the R10, at anything more than a normal listening level, the sound becomes very closed in. The HP4 has much more headroom.
One thing you should try is the not-often-mentioned EarMax Pro "super-duper-model". This retails for $1500 (I think) and is identical to the EMP but has better quality parts and tubes, and has a proper (ie big and beefy) power supply.
IMO, that should seriously give the HP4 a run for its money.
--Jatinder
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