I had an SOTM SMS200 Neo before the Mini. It is a superb bit of kit - with the right DAC sounds better than the Mini. You do need a DAC though which, I suspect, would put the overall cost above the OP's budget.
Another option would be a s/h Innuos Zen Mini - again fed into a decent DAC sounds superb.
If I haven't missed anything at the beginning, the OP has a Rega DAC -- so no need for him to pay for a streamer with digital to analogue conversion. No money for music.