dac for wadia 170 idock to krell 400i

just got the wadia and didn't realize my Scott nixon dac is usb only. so for around 400 or so what is the best new or used dac to hook up from the wadia into my krell 400i
thanks for your help,
i also own a 400i and love it enough to keep in these flooded water, but i use the new dacit from peachtree, a couple of more in hundred but worth every penny.......you will love it......i also use the wadia stuff ......into my totem forest....i also understand the new rega dac is outstanding, but again more money, but you the 400i deserves it...dwhitt enjoy the music