[outmatch]

I am looking for an upgrade from Heed. The budget is around 600USD.

My rig:
Stello DA100 > Supra Trico > cloned Heed > Cardas Crosslink > Denon D5000

Right now I have two amps in mind, which are
1.Stello HP100 (should have a great synergy with DA100)
2.MAD Ear+ Purist HD (I can find one used for 610USD)

I prefer neutral tonality, and listen to wide genres of music, from Bach to Coltrane to Led Zeppelin to Sinatra to Stacey Kent and so on . . .

Suggestions are welcome

edit: right now I decided to stretch my budget to around 1000USD.
And I have decided not to go tubes, so now my choices become
1.Stello HP100 + Cardas Golden Ref.
2.Corda Opera + my old Cardas Crosslink

I'm open to new suggestions.

 

[minimus]

If you can stretch a little, why not go for a Singlepower Extreme? It is a nice step up from the Heed. As Boomana once said in a PM to me, the Heed is a good solid state amp, but the Extreme blows it out of the water.

 

[outmatch]

I've just decided not to go tubes yet. So please recommend best SS under 1000USD.