Those are very nice speakers, so assuming that your sister has been around your system and has good ears, but isn't an audiophile... there are a lot of good integrated amps out there.
The speakers are 87db 4 ohm, so you will need something with a decent power supply and a minimum of 60 watts or so @ 4 ohms.
Here are my thoughts off the top of my head, keeping in the Audiophile tradition.
Audio Refinement Complete
Classe Cap 101/Cap 151
Arcam Delta 290 Arcam 10
I'm sure that there is a Cambridge out there
Rega Brio 2 (if it'll handle 4 ohms)
Old Krell (KAV 300/400)
Ton of stuff under $1000 that will do a good job.
I'd look at something like an IFI Dac or Schiit Modi Multibit Dac or Audioquest Dragonfly red/black any of these would give her outstanding computer audio.
She would be ready to go with a very satisfying system
I hope this helps, Tim
The speakers are 87db 4 ohm, so you will need something with a decent power supply and a minimum of 60 watts or so @ 4 ohms.
Here are my thoughts off the top of my head, keeping in the Audiophile tradition.
Audio Refinement Complete
Classe Cap 101/Cap 151
Arcam Delta 290 Arcam 10
I'm sure that there is a Cambridge out there
Rega Brio 2 (if it'll handle 4 ohms)
Old Krell (KAV 300/400)
Ton of stuff under $1000 that will do a good job.
I'd look at something like an IFI Dac or Schiit Modi Multibit Dac or Audioquest Dragonfly red/black any of these would give her outstanding computer audio.
She would be ready to go with a very satisfying system
I hope this helps, Tim