What to replace CAL ALPHA dac


Hello everyone,
I have been out of the loop from digital for quite a bit. I'm wondering what sonic improvement would the current/recent crop of dacs would have over my tubed Cal Alpha dac. I know that most new dacs interface with computers and while it would be nice as a supplement, my main concern is for CD redbook replay.
I bought this tubed Cal Alpha ages ago used for $400. My budget now would be more or less $750 new or used.
I would appreciate any suggestion with sonic comparison.
Thanks in advance
excelit
Oddiofyl, I have said the same thing about many items I have owned in the past, but I always wonder if I would like it as much now as I did then.
Listening to my vintage 1995 (non-24 bit, Sovteks, updated footers, etc) Alpha RIGHT NOW. Will run it for another 18 years if it doesn't die first. Nothing in its price range then or now comes close. BTW, using a Pioneer bluray player as a transport with a piece of crap Monster Cable SPDIF plastic digital cable. Nirvana for less than the cost of some amp stands out there.