Some ideas, with the core being a computer and a real decent DAC:
Decent netbook with large solid state drive for media storage ($500)
CEentrance Dacport usb DAC/headphone amp ($400)
Sennheiser HD 600 Headphones ($314.95 on Amazon)
Etymotic ER4 earphones for when sound isolation is needed -or different flavor ($299)
Audioengine 5 powered speakers when you have had enough of headphone listening! ($325)
Total: $1840
Decent netbook with large solid state drive for media storage ($500)
CEentrance Dacport usb DAC/headphone amp ($400)
Sennheiser HD 600 Headphones ($314.95 on Amazon)
Etymotic ER4 earphones for when sound isolation is needed -or different flavor ($299)
Audioengine 5 powered speakers when you have had enough of headphone listening! ($325)
Total: $1840