In your small room with highly efficient 620A's and generally listening to streaming, I would look at NAD, it would be very enjoyable. In my years of listening I've had and still have many Amps, PreAmps, Intergrated, Tubes, SS and for the money NAD is good sounding equipment. I prefer McIntosh tube gear, but that's not what you are looking for.
A decent integrated amp under 2K ...
I'm looking for an INTEGRATED AMP. My speakers are Altec 620A (100 db efficiency) and my listening room is 14 x 21. I mainly listen to digital files from my DAC (Metrum) but sometimes I feel less lazy and put on a vinyl on my Garrard. I don't need a phono stage, I use the one from another integrated amplifier (Spendor D40). Here's my shortlist:
1) Belles Aria Integrated (slightly powerful for my needs)
2) Croft phono integrated (since I don't need a phono stage, I think it's a shame to burn tubes for nothing)
3) Rogue Sphinx V3 (too powerful for my needs)
FURTHER CONSIDERATIONS: I can live with tubes but only in the PREAMP section and I try to avoid Class A due to the heat. I'm open to Class D (proof: the Rogue) but the choice is limited and these devices come with a bunch of stuff I don't need. I rather spend my $ where it will make a difference.
regards