I listen to analog using a Well Tempered Amadeus and a Lyra Delos, and digital up to 24/192 via FireWire and an Apogee Mini-DAC. My impression is that the very hi-res digital is as interesting as the vinyl, in its own way. Vinyl tends to be preferable to digital as the files get smaller.
So no, a turntable as you specify it would not be a waste IMHO.
So no, a turntable as you specify it would not be a waste IMHO.