The suggestions of any Wiim (mini or pro) are a great first start. I used my mini into my Bricasti DAC for quite some time.
I next was an early adopter of the Eversolo DMP-A6. For what it is and what it can do for under $1000 it is very hard to beat.
I thought I would upgrade relatively soon after that addition but am enjoying the Eversolo. The final upgrade to my system would be a streamer 20x the cost of the A6. But I realize I will not hear 20x the improvement because of diminishing returns and all that.
Happy listening!